Am I destined for a life of lonliness and despair?

I'm a 16 year old male from the UK, 3 years ago I had a group of close friends, we wern't the most popular but they were reliable. Something traumatic happened to me during the holidays my friend told everyone so we argued and the rest of the group abandoned me, I felt so low apparently they hadn't liked me for a while. So I struggled to make new friends, I've made a few but no close ones and i can't fit into a group because they are all formed and tight-knit. I try my hardest with people and get treat like muck, nobody seems to understand me or share my views, everybody's life seems to have developed and moved on getting girlfriends, going out all the time while I stay at home everynight and battleing Depression. I'm moving to a new school for sixth form to do my A levels in September, I'm nervous and excited. It's a fresh start to meet new people and leave the old life behind but it may go terribly wrong and I won't know anyone, I don't want sympathy I just want to rebuild my life, I've said sorry to my former friends but there not interested. On a positive not I was predicted all C's and since becoming a loner i've achieved A's and B's in everything but I believe social interaction would help me more. I put on this act to be a "cold hearted and ruthless person who hides my emotions, obsessed with money, fame and sucess" to hide my pain. What can I do?