I wouldn't call your thoughts abnormal or repulsive and as you said you wanted to get better it's certainly not an "illness" (although I understand it may feel that way to you with your families views).
Thoughts like that are probably a lot more common for people than you think but they don't necessarily mean that to be happy you would need to be in a relationship with a woman. You could try to turn your thoughts when you are feeling turned on by thinking of a woman to a man you see as attractive instead but if this is difficult then I wouldn't worry.
If it helps at all you wouldn't necessarily be hiding these thoughts from your family you just wouldn't be telling them, after all if you fantasized about a naked man/men you probably wouldn't be telling your family about that either? as it would be personal. As for others/friends outside your culture/religion then they may well be less judgemental. You could maybe subtly find out what they think by "asking advise for a friend" if the risk of loosing them really bothers you- but again it is personal if you don't want to tell them. Friends don't need to tell each other everything to be friends.