As far as the tight foreskin goes, there's really nothing you can do but go to a doctor and get... well you know... *snip snip*. As far as the orgasm bit goes, your best bet is to find a partner. I understand it's easier than done but I can say I've had this problem. I very very very rarely orgasm while masturbating but when I'm with the girlfriend... no problems
. Try it out and let me know what happens.
P.S. It's one of those mental things. Just stop giving a flying fuck and it'll be one of those things that'll happen when you least expect it.