Thank you for sharing your story. I think I was in a similar situation in the past. Please remain positive and keep searching for a solution for your acne. Thank God, Epiduo has helped me. Try to work on your confidence. Hopefully over time it will improve and in turn so will your willingness to interact with others. Working out helped me and continues to help me. How often do you train?
It is understandable that you prefer to remain alone. I was the same. When I was alone I was not conscious about my skin and what others would think of me. Having said that I realised that I am possibly an introvert. I have suffered from social anxiety and still do. It may be relevant to you too.