Hey brother, i'm 21 and i've been experiencing some of what your feeling, i'm not depressed or suicidal but when i was younger 15 - 19 my x girlfriend and i would hump like crazy, like 4 - 5 times a day, 3 - 5 days a week. and after we broke up i layed low on the sex scene for a while, now i'm with a new GF and we live like 4 hours away from eachother, so in december i went to see her i was soo stressed and felt crazy sexual anxiety. so i coudln't get an erection, i thought it was cuz of some physical reason, but i think it's all psychological, because i can get hard on command when i'm just sittin around doin nothing, but when it comes to seeing her, i feel like i gotta perform like a champ. . . . . i'm now understanding what my problems are . . . and just to let you know i'm in the same boat as you man.