Am I bisexual or gay?

Well i am 15 years old...I like masturbating with gay porns but i like masturbating with normal porns....Well i have never seen a friend (or a stranger) "different"...I mean i never wanted to have sex with someone or do general anything with him...well when i was a kid (10-11 years old) i was playing with my friend Grand theft auto:San Andreas in real life....You know..He was the hero and i was the secenery (his friends, cops, enemies etc.)....Just google GTA if you dont know what it is.....Well he get into a candy-shop and he wanted to make sex with a girl..At first we were dong it for furn with out pants up (we were not naked)...At the second time we done sex...i dont remember if he put his peni in my back hole (i am male if you dont get it and he was male too :S)....but i remember not having anything special..I mean i did not get turned-on...Actually to be honest i was turned on a bit but that was all...Well thats my problem and i dont know if i am gay/bisexual or not..I want to mention again that i have never felt anything sexual about a friend or a stranger..I also want to say that i have searched this matter on google so much..Other say that you are gay or bisexual other says that does not mean you are gay...Well i am not so sure..But i think my option matters...I dont have anything with gays i just dont want to be gay..I want to be normal...Also i dont have a gf for a long time now...(5-6 months) that can be the problem?...I started enjoying gay porn movies 3-4 months ago :S thanks you