What's wrong with my technique?!?

I've read that the head of men's penises are very sensitive, or the vein on the underside. But my boyfriend doesn't seem to be affected by it too much. In fact if it wasn't for the fact that he thrusts into my mouth when I go down on him, I would think he was completely unaffected....

Masturbate smarter, not harder

i am a boy, 17, and obsessed with masturbation. i do it more when i'm home alone. sometimes my penis hurts. but i think the reason i do it so much is that i don't get enough pleasure. sometimes the fluid just runs out and i don't feel a thing. also, i tend to feel tired. please help!...