Girls reject me all the time.
What are you doing to even get rejected?
I'm trying to be nice and personable, i'm not scared of approaching them, I'm not doing it in a creepy and/or aggressive way and I'm doing the same thing as the guys.
I'm sorry you're having such a hard time with women, but if you are truly doing everything like you said, you just have to find the right one. Not every girl is going to swoon and get all over you, and it's going to be hard no matter what. Just be patient and don't become an incel.
I've been trying for years now to get a girlfriend, I don't want to try anymore. I want to give up.
You don't have to stop trying, you just have to stop expecting them to accept you. You should try with a lot less intensity and if it works out then it does.