Hi and welcome!
I can barely see your birthmark! Plus, I think you look about 12 years old, but I'm an old lady, so my opinion probably doesn't mean much.
What are you studying? You are very well-written and seem smart. University can be difficult, socially, even with no birthmark. Suddenly, once you're done, it seems that it gets easier to meet people and date. My advice: work on your studies, try to make genuine, authentic friends, and have fun. The rest will fall into place. Trust me. I'm an old lady, so I know.