Why do I like male/male more then male/female?

I'm a girl at the age of 15, I like watching male/male videos but I hate watching male/female that makes me feel sick.. Am I weird?

Haha no, it's perfectly normal. Some guys like watching lesbian porn and some like girl/boy, it's the same for girls but with boy/boy instead (unless you're gay, asexual ect.)
Honestly whatever ever turns you on doesn't really matter, it's not like you have to tell anyone what you like and don't like.

There is nothing wrong and weird about it, you can explore your preference as you age, just be confident with whatever you like