Ive been in your exact situation. First of all let's both be proud of ourselves for having our priorities straight and putting education first!
I waited until after college to do all that stuff too. I tried a dating app and found plenty of guys on there. Problem was I would usually meet for drinks. Then I got dependent on alcohol, and I got date raped several times.
Not putting your career first is a huge mistake right now. I've switched jobs for a man before, it's a huge regret I have. You are still young,. You do not need to worry about getting married and having kids right now. Any dating you do is just practice that likely won't last or be stable.
And forget about feeling unattractive. I was hot back then and I still couldn't get laid because 1) I had no experience doing nasty stuff or being on top and initiating. I still don't prefer to. 2) I went after what I thought I could get, which was old low life's who of course treated me like garbage because they treated themselves like garbage. 3) I acted too confident and sure of myself. No one wanted to date me because I made them feel insecure and ashamed of themselves.
I have a friend who told me she hasn't had sex in 5 years. She said she weighs it out like this, do I want sex bad enough to deal with drama? No.
Don't let anyone jerk you around and for God's sake practice how to use a condom because most men will not use one and then they give you STDs, which I have had because I didn't know how to use one. Get vaccinations for hpv too.
And another thing, I was afraid sex would hurt because so many women told me it would. My first time was great, didn't hurt. I think you have to remember that alot of girls lose their virginity really young. Of course it's going to hurt when you are a child who has barely even used a tampon.
As far as advice on what kind of guys to go after, find someone younger who hasn't been ruined yet by another woman. You don't need someone judging you and comparing you to their ex. Find someone emotional and willing to wait to have sex. Otherwise you will have a fuck buddy but no emotional growth, just pain.
One reason I stay with my man is because he isn't judgy about what I can or can't do in bed. He is very emotional and when we first started dating he wanted to work on building a connection. We waited almost 2 months before sleeping together.
Just please don't go whoring around drunk in a bar. It will ruin your career. You don't want to have a kid with a guy like that anyway. You have plenty of time, don't feel so desperate.

Have you thought about a computer site for dating? I have and I am much older than you are. You can tell them you are interested in just dating or more if you want it.
My problem when I was your age was married men. They seemed to think I was "safe" but I didn't take advantage of that. Now the guys around my age are not interested in any kind of relationship so I am single. I know the pain of being lonely and it sucks. I am told there is a guy out there for everyone but they are hiding! I still pray for a guy to just be there for me. Not giving up!
Take care
Mary

I think you are putting way too much pressure on yourself IMO, you have loads of time left, so just enjoy your freedom a bit longer, you will miss it when it's gone, I understand what you mean about the social anxiety I had it for years until I jumped into the fire as it were, 18 years old I was asked to up sticks and move to a different continent, on my own I( best thing I ever did ) so dont rush things , and don't run yourself down either, things will happen in their own time, just have fun while you still can.

You do have lot's of time.....life is short.
I also have the same problem, I'm 43, I've never been in love or had sex, I've had my chances, I've talked to girls, on dating sites,,,,,Just about when we were ready to meet, I back out, The anxiety got the best of me.......I think about marriage and kid's,, Without even getting a chance to know them first.

Like You, I want to care about that person before I have sex with them.

I know Ya feel like giving up sometimes......But, don't.

Life has a way of letting someone come into our lives when were not even thinking about it.

i'm 28 and in the same boat, most of my family, friends, and nurse won't even attempt to discuss relationships or sexuality, i came up with 4 phrases that I believe everyone should follow for a successful relationship one early morning lying awake. In order for any relationship to work we need to see Empathy, Compassion, Love and Understanding in our partnership with someone! i'm sorry to tell you that there is no such thing as casual sex in any healthy relationship. I'ts a cop out for someone to justify abuse. I hope you can find peace reading my post and try to talk irl with your parents or someone you trust.

best of luck

Niko

Well, I say congratulations to you on your diligent studying, wow! You have time, you are not the only one, there are many who are in your shoes, they just don't tell. It will happen at the right time with the right person. When they come along, you will feel comfortable with them and able to open up. I'm proud of you for not giving in to the pressure of casual sex, it is a big thing and you are a treasure, not to be given lightly, but only to the one who will be there for you and love you correctly. btw: regarding depression, taking magnesium is great to calm the mind body and spirit and get rid of anxiety and also taking ginseng will get rid of sticky negative thoughts too. You got this, you are a courageous winning person, kudos to you!! =) <3