Confused about my sexuality...

Hi,

I'm a 19 year old virgin and currently confused about my sexuality. Basically I definitely like girls. I have no problem masturbating to a picture of Kate Upton or whatever. However, in the past year or so I've noticed that I've developed feelings for a boy who was in my year at school. This happened with another boy before this aswell. The weird thing is, although I can accept that the likes of David Beckham and Brad Pitt are good looking, I can never imagine myself having sex with them or being in a relationship with them. It's like I'm extremely picky with boys, and I only seem to like ones that are quite feminine or have feminine looks about them or are quite youthful looking. This made me think that I may be a hebephile or a ephebophile. I'm sure that when these two boys get older I will no longer have any interest in them. Also if I were to swing that way, I couldn't imagine receiving anal sex.
Do you guys think I'm bi-sexual or just like boys that look feminine/young?
If I were a hebephile or ephebophile I would never do anything illegal.

I know that people like to label things but I am a strong believer that sexuality cannot be labeled... If you label something it becomes so definitive... sexuality is not something that needs to be defined, it's who you are, it can flow from one end to the other.

You should not worry about it, if there is someone you like, then there is someone you like, doesn't mean you now come under a specific label