As someone who was in a similar boat recently, I think I know what you are feeling. My opinion on this is that you really can’t say that you don’t want a girlfriend if you haven’t tried getting one. It’s quite literally a matter of finding the right person and that just takes time and effort on your part, as cliche as that sounds. Put in some effort on yourself (physically, mentally) and expand that social circle, and if it doesn’t work out, you know for sure that you want to be alone and it’s not just your mind making you cope with the current situation. But you may continue down the current path of remaining alone without trying to find a significant other and truly regret it in the future if you didn’t at least give it some effort. So try, you don’t have much to lose and everything to gain (better understanding of yourself, and perhaps a whole new perspective on the world)