First: Congratulations on all your hard work to meet your goals. I’m sure it hasn’t been easy to achieve so much in school when academic environments are so difficult for you. Do take pride in that. You deserve to feel very, very good about it.
As you well know from your own experience, people can do exceptionally well in some areas of life and still have issues in others. From what little you were able to share in a short letter, I suspect that taking responsibility for your own decisions is a struggle for you. Your mother couldn’t “make you” buy a car you don’t want. An anonymous stranger who keyed your car didn’t “make you” think you had to buy an elaborate security system or a gun. Other’s can’t “make you” obsess about revenge. As you rightfully point out, you could lose everything you have worked so hard for if you don’t get hold of this issue.
I’m not very impressed by labels. Whatever the diagnosis, you need to work with your psychiatrist to learn some new ways to cope with being in a world inhabited by sometimes thoughtless (and sometimes even mean) people. You take things very personally – even when there is no reason to think they are personal. You then go over and over your hurt and anger until you work yourself up into quite a dangerous rage.
Even when you aren’t feeling targeted, you don’t know how to fit into the social world. Isolating yourself and limiting contact with other people is one strategy for reducing your stress, but it doesn’t help you learn to manage those times when you simply have to interact. Unless you go out into a desert and live as a hermit, interacting wtih others and sometimes being slighted or misunderstood is part of the human condition.
If your psychiatrist only presecribes medication and doesn’t provide some talk therapy as well, I strongly urge you to find yourself a psychotherapist to help you learn the skills you need to function with others. You’re a smart person. When you are determined, you do what you have to do to learn things. There’s every reason to think that a combination of medicine and some therapy will help you feel more in charge of your own decisions and less anxious around others.
I wish you well.