I have no self confidence how can I build that?

try to remember all the things that you had success to manage it. by thinking that you can make it, i believe it can raise your confident too. and don't forget to maintain your style. however appearance is the first thing that people judge at the first sight

what does that voice in the back of your mind say? what make you ashamed of yourself? this could be anything from acne, to regrets,or friends at the school. Whatever is making you feel unworthy, ashamed,or inferior, identify it, give it a name and write it down.

First, you need to be active for outdoor activities. I suggest that you may try to look for a job which is suit to your ability. If possible you may start working from low level task such as cleaner, packer or worker. Try your best to improve yourself by taking course at your free time and you may uplift your spirit one day.