Alright, as a recovering "clown" there are a few tips i may have for you that may be of use. First, just be yourself. Alot of guys try to act funny and be a clown just for attention. Well, you don't really need to go out looking for that attention, just let it come to you. If a girl is interested she will talk to you. Another thing is people's opinions on you don't change over night. Try to rebuild relationships with those certain people and let them know who you really are. Personally, the clown persona isn't all negative. Some girls are really attracted to that type of personality, but others (which is the majority) just think you and your group of friends are immature. It takes time man, and you just might out grow it.