Tell your girlfriend straight up, that will help you. Honestly. Relationships backbones are built off of honesty, loyalty, and integrity. You don't need all those other girls attention man, they won't help you in the end. There's only one person that will love you in the end and that's the girl your with because she will know you the most!

I also read that you can't help but lie about small certain things, try telling the truth the whole truth to somebody or something, like maybe a journal at first, I hope you if the help you need just keep trying

You're on the wrong forum., this forum is for people being cheated on, so you wont receive any sympathy or understanding here. You need to take a good look at urself in the mirror and look up what love means. You say you love her, however loving someone means putting their interest and needs ahead of ur own, making sure to never hurt this person. So I don't think you really know what love is at this point.
Of course you can stop this behaviour, you just don't want to, just be honest to urself. Its pretty simple, don't go on the computer, don't message anyone and don't post adds. Its not like an alcohol or drug addiction, this is pure just a matter of self control.
Do you that you are on an extremely slipperly slope, its just a matter of time until you will cheat with your current behaviour.
Don't do this to your girlfriend. Come clean be honest to her about what you did. If ur truly remosefull and committed she may appreciate ur honesty and give you another chance. but be 100% honest not just what you want to tell her to safe ur ass.
Get therapy, cause this kind of behaviour stems from unsolved past issues, selfishness, entitlement and lack of empathy, very poor traits for a partner. Change yourself for your own sake, cause if this relationship ends, at least a future girlfriend will not be betrayed.
And please google what infidelity does to a person. Online cheating is also cheating. Cheating is the worst kind of trauma someone can experience. its crushes your partners self esteem and trust in men. don't do it, man up kick ur ass and get therapy. be honest with urself and with her. If you cant than set her free, she deserves an honest man she can trust.

if you loved your girlfriend you wouldn't do sneaky things that would hurt
you are full if shit
the sooner she catches you the better for her
so can get away from you

Tell her what you did and let her decide if she wants to stay with you.

Exposure is generally the only thing that makes people take a look at who they are and made a decision to change after seeing the damage their selfish actions cause.

You are obviously getting something out of it? What is that? What does that give you that your gf doesn't? How do you feel when you look her in the eye after what you have done? Maybe it sexually charges you. If you spent 1/10th of the energy your spending in these online affairs, maybe your current relationship would be better. Tell her what you did. Let her decide. Be transparent.

I don't think you need advice. I think you are missing the integrity and more to the point, the maturity it takes to even be exclusive in a relationship. You're every girl's nightmare. Apparently, this forum is extremely edited. Anything I post that isn't fluffy and sweet gets deleted. Let's see if this truth does as well.

@samedeal really? I didn't know they deleted comments from people, I thought they only delete spammers. I've seen much harsher comments than the one you just wrote, so don't worry. This is simply not a cheaters forum, so any cheaters have to be prepared to hear the truth, no need for a censored version in my opinion