I never get fully rejected, this has happened several times. I meet a girl, she likes me, we get physical, and then it all goes down hill. Things never pick up after that, but they never flat out shoo me away. I just kind of sit on the back burner. They claim to be busy and never fit me in their schedule, but they always quickly respond to my texts. Now that I think about it, I never really get to show off my personality. I am a good looking dude, and most of the time girls come onto me and admit to being interested in me before I have even demonstrated my basic personality. They will tell me I am good looking, give me there number, text me a lot, hangout, text me a couple times, I try to make plans with them and they're busy, and then nothing escalates. What am I doing wrong?

It's really hard to tell from so little facts but here is what I can tell you. There can be 2 reasons why this happens. Reason number 1 is your not showing the girls your interested in them sexually, in other words you don't make a move on them. So they begin with attraction towards you but when you don't make a move it turns into friendship. Making a move means either getting physical or going for the kiss or some other sexual behavior towards her. Reason 2 your not being genuine, your not showing your true personality. Girls have very strong senses when it comes to finding guys who don't show their true self and thus are needy. So just fix these things and you'll be good.

_________________
"Experience is the teacher of all things"

Are you perhaps expecting the woman to escalate? If so that's your first problem, women expect men to lead/take the initiative. Always pursue women from a sexual frame, once you've dropped this frame you're well on your way to friendzoning yourself which is an extremely tough role to break free of.