Agree with Buddhist Wife on all counts. I would only add that if you can’t get a therapist, or want to self-learn some techniques to combat fears and anxiety, check David Burns’ “Feeling Good Handbook”. Also, join some martial art classes, such as karate. Besides practical benefits directly addressing your fears, it is good for your health – physical and mental, it is fun, is suitable for introverts, and is an opportunity to “take out the anger” elsewhere than on your boyfriend 😉
cheers