You come on to women who are not responding to your come-ons? Wow. Do you use the lurch, grab and sloppy wet kiss method?
A physical come on is different. There is no way to know the outcome if you don't try. There is a name for guys that don't take risks, losers. If she rejects you then fine back off and find someone else. Plenty of fish in the sea. That is how the game is played.
Guys that don't back off are creeps and need to be kneed in the balls.