Yes, perhaps you could provide some more details. For instance:

There is no medical connection between masturbation and decreased erection size, if that's what you mean. I would say that if you're masturbating several times a day, it is physically more difficult to maintain a full erection on time number 4 or 5. That, however, is not permanent.

Now I'm quite confused. Despite what the above poster would have you believe, masturbating does not mean you are (necessarily) sexually attracted to men. That is a seriously false claim. However, if you weren't "interested" in it, why would that even make you think that you might be gay? I don't understand the reasoning, even taking into account the fallacious (heh) association you mention.

I assume you mean "endocrinologically," and you'll have to explain again what you mean.

Hopefully he has already told you that no, it is not.

...and how many times did you masturbate before that?

I'm not trying to make you feel stupid, but rather point out some (what seem to me as being, anyway) illogical conclusions to which you're jumping in order to 1) reassure you that most likely masturbation has not permanently damaged your penis; and 2) get you thinking about what could be going on beneath the masturbation. As someone who deals with obsessions and addictions to pleasurable activities, I would hazard a guess that you are masturbating to mask some other feeling and anxiety. Feelings and anxieties, which, I may add, can have an deleterious effect on sexual performance (rather than the actual masturbation).

So - obviously something is going on, and it'd behoove you to clear your mind about the physical worries so that you can concentrate on the mental and emotional stuff.

Good luck. And check out some other fora when you have an idea of what might be happening inside.