How to make friends without sabotoging them?

You're reacting to events that have never taken place nor probably will ever take place, so you need to understand that first. Your fear is something you need to overcome just by continuing to be friendly to others and having good conversations, only time will help you overcome your fears. Remember, all the people you meet more than likely have the same fears you have, so when you focus more on the other person you forget to be afraid for yourself.