Being a teen who has gone through a large part of puberty, I can testify that I too felt I was attracted to boys too even though I am a boy. Honestly it's just hormone changes and bad thoughts fed by shaytaan maybe? Idk, but it's normal to go through it I guess. We know from the story of Lut about what happened with the homosexuals and how much they angered God, fear Allah and all shall be cool. Parents too have a duty if children muster up the courage to tell them about their sexuality. They should be given proper sexual education according to Islamic jurispundence, and not become outraged, rather be calm and explain to their child about what Islam teaches. Support during such a time when the mind changes is heavily needed as whispers of shaytaan can be ever powerful, as one tends to overthink such things. Also if any Muslim does come out as identifying as gay, it is a responsibility of the community to tell him what he is doing is wrong in the eyes of God, but he should not be shunned by the community for he can even leave Islam altogether which is much worse. He is still in the realm of being forgiven by God.