I think addressing the compulsive masturbation would be the best place to start. The other stuff (fear of homosexuality, loss of "size", lack of interest in GF, etc.) should all improve if you are able to get a handle (no pun intended, sorry) on your multiple daily jack sessions.

Good luck, and avoid the online pr0n as much as possible. (Also try some kind of DBT/distress tolerance-type therapy as well?)