I am a 15 year old boy and confused about my sexuality?

I am very confused and flustered with my sexuality at the moment. My whole life I have been very turned on by women and identified as a straight male until recently. I used to be so horny thinking about having sex with girls every hour of every day. One day I became good Friends with a boy from school. He is very good looking, gets all the girls, popular, has a nice family is in the state team for basketball, but compared to me who is average looking, fairly popular and average at sports. We both got along well with each other until I started to get a man crush on him. Not in the sexual way but I would always try to imagine how good his life is, what it would be like to be good looking and get any girl you want. At this stage I still believed I was 100 percent straight. After fantasying and sort of being obsessed with this boys life it eventually made me see him in a sexual way. At first I imagined holding his hands, than hugging him, snd now to giving him a blowjob. This is when I understood that I was probably bisexual. In the past I have Sometimes get slightly interested in some boys but they have to have tanned skin, be small and feminine, but never to the extent of this boy. This has happened like 3 times but never fantasised about it (He Has those features).

When masturbating I can still get off to women but it’s not the same as it used to be. I would never watch gay porn it’s disgusting and gross and would turn me off. Instead I would wank to his Instagram and imagine hugging and kissing him and giving him a blowjob and **** like that. (He’s the only guy that’s ever made me feel this way and I know a lot of good looking guys that I do not find attractive. When doing this I feel like I’m sinning and never orgasm to his face I will switch it to a hot girl to make myself feel better.

My theory is I’m 90 percent straight and 10 percent gay but me fantasying about this boy caused me to fall in love with him causing all women to seem less attractive.
If in fact you believe I am “turning gay” and you say “what’s wrong with being gay” well where I live they are not accepted and tolerated where I live and to be completely honest being gay would destroy my life. Secondly I am trapped as no males are attractive to me except this 1 boy and women are no where near as attractive as they used to be. As if I don’t have many friends that are girls or talk to girls maybe my absence from them cause me to “forget” about them.

Maybe I am just overthinking and don’t allow my brain to fantasise about girls because I don’t have the self belief and worth to believe I can ever pleasure a woman, can’t see myself doing it so I disregard it for lost hope. At a party recently hugging girls made be slightly turned on but not enough to seek out their attention to try and talk to them. To compare this to before my “libido” hugging an attractive girl would give me a boner. Maybe I am just growing up?

To some this all up this one boy is my only passage to being turned on, all girls seem 5x less attractive as they used to but wanking to them doesn’t have the same “feel” if you know what I mean. This is affecting my life so much right now as I get less urges to go talk to girls at party and get a hook up etc or hit up girls on Snapchat.

Please help me out... has anyone had a similar thing happen to them. Can your sexuality change? Could smoking weed around casually once a month be affecting my mental state( I’m 2 month dry now though)? I am not a feminine person and would say I am quite manly.

Can someone please explain what I am feeling and why this could be happening, because I am currently lost and scared that I’m turning gay and is taking a toll on my mental health.

Thanks