confused and married 10 years

first time poster/blogger or whatever and i have something i want to get off my chest. I'm 32 (very close to 33) and i feel completely unsatisfied in my sex life. i've been married to a wonderful woman for 10 years and i honestly can't satisfy her. not that she is overly sexual but actually quite the opposite. almost completely non sexual. i don't know what to do. i love her and our 2 beautiful little girls but i'm completely unsatisfied. i fell that that the statement/situation is fairly self centered but i'm left confused. i know she loves me and i absolutely love her but i hate our sex life. she won't let me do this or that...touch here or there...or try this and that. i've tried the regular, asked about the "oddities" and have tried the fun/acceptable things (vibrators, movies, massage oils, and very open talks). i feel she doesn't like sex and i'm obsessed with it. i walk around with a hard-on for most of the day (she has a beautiful big,relatively, ass) and she thinks my stuff (we honestly can't talk adult about our sexual organs) is obtrusive. I'm 6'2", 220 some lbs, and not ugly, but i think my sex drive is too much for her. anybody have any advise or thoughts on what i can try???? i love her and do not want to...well separate but i hate our sexlife. i feel it's selfish but no less true for that fact. somebody slap me or throw some truth at me...PLEASE!! thanks