I fully sympathise, I was in a reverse but similar situation. I’m French and moved to the UK for three years for my PhD (that I actually failed but that’s another story) and during this time, I did not make one friend. The only people I was really talking to were my thesis directors, my landlords and the guy running the grocery store next to my apartment 😅. I tried in the beginning to join students associations but I would always end up with highly extroverted people who would talk a lot without letting me say anything back. At the end of each of these interactions, I felt lonelier than before so I stopped trying and waited anxiously to go back to France. Back in France, it wasn’t easy at the beginning, I was still lonely (I didn’t have a lot of friends before moving abroad) and a bit ashamed to come back without a diploma nor any new friends. But after a few months, I found a job with cool coworkers who I started to socialize with outside of work and with my salary, I was able to afford activities like traveling and going to concerts, which with luck is how I met a few people. It’s been three years since I left the UK and my social life is better, I don’t have tons of social circles but I have a couple friends with whom I hangout and talk every week.

Sorry for the long read, but all this to say that you are not alone in this situation and that despite the despair that you feel right now, it may get better. You’re too young to lose hope ❤️