I'm not a woman, but I've read (here and elsewhere) that if you can find out through masturbation what brings you pleasure, and have a patient b/f you can help him help you reach orgasm by showing him what to do. It may not be through intercourse...it may be through manual stimulation of the clitorus or oral..also make sure he takes the time with plenty of foreplay and is genually interested in satisfying you..
Jim
my girlfriend is like you before and she really love it when we have sex but she had a hard time to com... she too felt bad about it. so what i told her is to masturbate and find time to not get stressed and relax. tell your boyfriend to pleasure you a lot before sex tell him to find your g-spot and work it. talking naughty and when you miss him helps a lot. i suggest reading cosmo coz my girlfriend did that and i'm so lucky coz she squirts.. you might do too. good luck!