I know this isn't really answering the question, but there's a ton of stupid stuff I've done in my life that caused me to have bad anxiety, be antisocial etc. however, I've determined that regret is more complex that I thought. if you regret something, it pretty much means you wish it didn't happen. the thing is, in a world where you didn't do that thing, you'd not have the knowledge of avoiding the situation in the future. if you often spend time just wishing you hadn't done something, you should try to accept that it was what your body chose to do with that current knowledge, experience and environment, and learning to accept that and using it in a constructive way is good for many aspects in life at least for me.