If I talk to any girls, usually they just let me touch them and I get 0 resistance. But they almost NEVER do anything back. Why does this happen, what does it mean and most importantly what am I supposed to do about it?

I take the lack of reciprocation as a lack of interest. And before anyone says shit like "OP escalate harder!!". I do escalate hard, I am able to touch their thighs, hair, face and whatnot. I just don't get the girl touching me back. The only possible way to go up from there would be to go in for a kiss, but I can't really do that if I am not sure if she is interested.

Edit:- Forgot to mention. I do sometimes get reciprocation if it's a smaller thing, like holding her hand and stroking it with my thumb. Girls normally do it back.