I think you need to embrace the reality. You don't appear to even be bisexual, but rather outright gay. There is no point in fighting your nature... your essence. So good job not punishing yourself with this man and keep it up (keep not punishing yourself).

Of course you are very young, but still, a life wasted is life wasted at any age. You may waste the next 5 years and then finally accept the reality, or you may accept the reality now and find better ways to spend the next five years.

Your non-rising to girls is a way in which your body, heart, and mind are trying to tell you something very important. Listen to them!