Any of you have some advice or experience getting over this problem

I’ve been called good looking by many girls before, and there first impressions of me when we first make eye contact are good(I.e they seem to be interested) then once I get to talking, the interest level drops a lot. Some guys I’ve noticed are just really quite and somehow get the girl. Meanwhile I try to be myself and have fun and almost every time turn the girl off. In college by the way, for reference of age.

Any tips or experience with this kind of problem?