My number one mistake is that I've chased women before, and I know some of them actually actually liked it, but they didn't have any feelings for me. I don't think it was my attractiveness either, but me telling them that I liked them totally killed any attraction they had of me. I was a needy douchebag, and I would like to change that. Anyone got advice?

Also how do I talk to girls again? It was so easy in HS because we all knew each other via social circles but in community college it's much different and it's like building up those social circles again.