I feel like I'm failing life and I don't know what to do

For context I'm 14 and I havent been going to school for 4 months because it really impacts my mental health but because I'm not going to the main building I go to a smaller building where no ones there however these no professional teachers so I feel like I'm going to fail my education and too me if I can't get good grades I think I'm going to fail in life because I can't can a good job I'll be unintelligent and so on so I want to go and get a proper education but I really don't want to go back to school because of the people and the environment and the school system in general also because I'm the "quite kid" all the popular people will come up to me and talk to me and act like we're friends but there just trying to get a laugh out of me and make fun off me also I only have 1 proper friend however I'm also ruining that by not meating him in person because I'm embarrassed I suppose also no ones ever gave me a complement apart from people in my family. So I'll just end up as a poor ,friendless , stupid person who failed in life. I don't know if there's even any point.