Sex for the first time without feeling

Been thinking about just have sex with no feelings at all. I am the type of girl that likes to be single in no need of a man to keep me happy! Making me happy is going to school and learning and making a difference in society... But I have just wanted to know if I should just have sex with some one I've know since HS.... However many tell me I should wait for the right person and time?!? Any thoughts...