Why apologize? You did nothing wrong <3 Impostor Syndrome can be a bitch i know, but lets be honest, it is really fair to punch down on you because you are the odd one out? What about your friends? Do they help you in anyway about how you feel?
I am asking this questions not to put the blame or you or them, more soo as a reflective exercise. Because friendship can be messy, they change a lot of the time. You never met the same person twice, not even inside the same person. People change for better and worse, and you do too. An sometimes that can increase different feelings, including loneliness.
But i will say one thing... I am sure you are a very likeable person <3 I know online is different, but be kind to yourself, you are make a lot of people happy here with your silliness and miku post <3 I am sure you are great and keep fighting <3
There is nothing to apologize, thank u soo much for being here, you always are lending positives vibes to others. Is your time to be loved too <3