Socially isolated for more than a year. What to do?

Currently I have had no friends for over a year now. I have a small family who I hardly talk to anyway as they are not the most positive of people. Most of my time is spent in my bedroom. My aim was to get to university but it seems two of my exams haven't gone well and so I fear this is going to go on for another year. I was in sixth form where things were alright for a bit but I had to leave in the second year meaning I had to change all my subjects to ones I could teach myself. It looks bad on me as it appears I have had to resit loads when I have just been unfortunate so universities won't want me and now I am getting older I probably won't even get a job. I am quite a positive person and have been battling negative feelings quite well but I fear soon they will overtake me, I am starting to feel the effect of having no one to talk to and I don't want to lose myself in depression. Once the negative feelings come it becomes a negative spiral which will make things worse, its not where I want to be. So I posted here for advice? Any ideas as I don't have any? I don't have problems with anxiety and I have been quite unlucky to be in this situation. I have a hard work ethic and want to get on but I am not in the ideal situation. Thankyou

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