with my boyfriend for 4 years now and I have never ...

Hi,
Welcome to ehealthforum,
Orgasm in females is of two types, vaginal and clitoral. If you have been used to masturbation, then it is unlikely that you will reach orgasm with normal sexual intercourse (as your brain gets tuned to responding to a kind of stimulation resulting from habitual masturbation). If you are not able to achieve orgasm, you need to stop masturbation and allow your brain to get re-tuned to normal. You should consider visiting your gynecologist/obstetrician for a thorough examination and evaluation. Treatment as appropriate would be started to help you (based on examination and investigation results). You can also go ahead with getting couple therapy/counseling done by a counselor/sexologist to identify the problems and get them resolved (this is helpful if you feel lack of connection/involvement with your partner, any unresolved conflict, infidelity, poor communication, mental blocks, bodily embarrassment, etc). Hope this helps.
Take care.