Sometimes helping others is the way to go. Look at all your experience yes you are just 15 - but you know your way around WDW - there are alot of people both adults and teens who could use your help. I know that right now anything to do with WDW is a cause for depression - but just think how good you will feel when you answer the person question. Give it a try - it doesn't work for you - then try something else. the advice about meeting new friends is good - but I know it is alot harder to do it than to tell someone to do it.
you are going through alot of changes - a new school, new neighborhood, new life style, and you are teenager when your whole body is changing. Life will be tough for a while - but you can always come here to talk about WDW - and hey your parents (when they get settle) may take you back to visit.