You led with the idea that you are confused about everything. I don’t think so. I think you are the kind of person who asks the big questions. You are exploring the meaning of life, spirituality, ethics, and morals. Although you are frustrated with the inability to come to conclusions, you and I both know you would not satisfied with glib or easy answers. It’s also unfair to yourself to label your restlessness as “confusion”. Rather, you are struggling with the task of sorting deep and intricate ideas.This is not the stuff that the usual 16 year old thinks about but you’re not the usual 16 year old.
I can’t, of course, give you a total clean bill of mental health on the basis of a letter, but I can ask you to sit with the possibility that you aren’t ill but rather that you are a philosopher in the making. You would probably find it exciting to meet and talk to other people like yourself. University level courses in cosmology and philosophy are something to look forward to. If there is a college nearby, I encourage you to sign up for a summer philosophy course to help you organize some of your thinking.
Then again, just because someone is a philosopher doesn’t mean that he can’t also be depressed or anxious or have social anxiety. For that reason, I suggest that you seek out an evaluation by a psychotherapist. Talking with a skilled therapist may give you some reassurance as well as some practical skills for grappling with such big ideas.
The excitement of the pursuit of truth is what balances despair for many philosophers. Engaging with others about ideas is what can make life satisfying and worth living. I sincerely hope you will join in that kind of conversation.
I wish you well.