There is ablsoloultey nothing wrong with you at all my friend. I am also 15, and have not had a boyfriend yet, and i know many gilrs the same age who havent- so there is nothing to worry about! :)
You will have a boyfriend im sure of it, as everyone has someone special who is in their life, and you just havent found him yet, love. :)
Dont be worried about it, because im sure you are a beautiful person and will find someone soon.
Shadow x