I'm wasting my life!

Hi you guys,

I'm in my early 20's and I feel so lost. I don't know what to do with my life. I don't know what I want career wise. I want to make a difference in the world but my fear of failure, embaressment and speaking in pubic even in groups of 3+ has stopped me from giving my potential. I love helping people and animals but I'm afraid or talking. Even taking college classes in school gives me so much anxiety. Everyday when I went to an in class class I felt as if my stomach was upside down like I just got off of a roller coaster or something.

I'm taking online classes as a result. I feel like I'm missing out in life because I'm so afraid. I'm tired of being afraid but I don't know what to do about it. I'm just studying my basics right now because I'm so indecisive on what I want to study. I am currently looking for a job but every interview I go to I get so nervous that I sound stupid, I can't think of what to say or how to respond to their questions and it is so hard. So with online school and no job all I do is stay home and it's starting to eat at me. I'm becoming depressed because I feel like I am just wasting my life. What can I do to get over my fears? This is so life draining. 

I want to lose weight and I have so much time to cook and workout but everytime I think of it my body just shuts down and I decide not to... I feel like I am addicted to tv- netflix in particular or my phone, the internet, because everytime I'm away from my phone all I think about is going back on it or watching my shows or checking IG or SC or whatever. I'm tired of it. I can I actually start doing things. I know i could just stop and just do it but I don't and I dont know why. I want to tho. I just need help or advice. 

Thank you all!

-ShyGirlLili