I feel like a social outcast everywhere I go. How could I change that?

you ARE the cause of your own problem but its not your FAULT. i have the same personality. so i joined a crap ton of extra curriculars. and forced myself to be ore social, tho now i have new problems. my suggestion is to find the nicest co-worker you have (or neighbor?) and start networking and meeting new people. just be you....then pump up the happy..if you fake it long enough, it will eventually be partially genuine