I am 20 years old. Ever since i was 5 years old i mastrubated by essentially humping a surface such as a couch arm. i started to ejaculate when i was about 13 and ever since i have reached my climax without an erection, seeing as when i put my weight on my penis no blood can come in. I have no trouble getting an erection at all or keeping one. I even precum when I am having minimal sexual experiences. Recently i have been trying to mastrubate normally but it doesnt work. I can pleasure myself but never reach a climax.

The other day, my girlfriend gave me oral sex and it even felt very uncomfortable when she used her hand towards the top of my head. I had precum, but had her stop after it wasnt pleasurable in 5 minutes. after which, i got immense pain in my testicles, which im assuming is what they call "blue balls". it went away after i mastrubated like i usually do.

1. do i have nerve damage b/c it felt uncomfortable and i have less feeling towards the bottom of my shaft?

2. Will I ever be able to ejaculate normally from mastrubating normally?

3. Is my penis permanently damaged from masturbating this way for so long?