Try mastubation until you have an orgasm.
Mastubation is not dirty and many people do it.
I wouldn't worry as i have never heard of anybody who can not acheive an orgasm.
I guess that going to the doctors is unlikely so try afraidtoask.com
On that web site you can ask a doctor although it will cost you.
but there is information on the site too.
I fell sorry that nobody else has replied to you and am sorry that i cant be any more use to you.
Please tell me how you get on if that is ok with you.