I am kind of put off by your description of your psychiatrist.

No, it's not a great psychiatrist when they subscribe you drugs to "fix" things. Drugs should be the very last resort. A psychiatrists' role is to help you with self debugging your memories and to help you put them into a context that you can understand easier. They should be a guide for dealing with emotional trauma and help you process and understand the loops that make you feel helpless, and to help you understand the moments that were out of your control.

Please, OP, find a psychiatrist where you feel safe to share, and that helps you to deal with the emotional loss. Swallowing it up because society expects you to be a "man" is unhealthy behavior, and carrying over trauma into your next relationship is unfair to the other/next person in your life.

Other than that, my advice would be to write a list of things you always wanted to do. And just do them. Find out what you are passionate about and what makes you happy.

Find a sport to keep your biological machine maintained, and find the thing you care about the most. There is a lot of problems in our society to get involved with. If there is no community around the things you care about, then found one and invite others to join.

You are not as alone as you think, you just stopped reaching out.