Ok so I don't really know how to help with the self-esteem thing because I have a problem with that myself but try just thinking about yourself positively and think about the positives instead of the negatives. But just try talking to people who you find interesting. Ask them the time or something like that if you don't know what else to say but then go on from their and just be yourself (which you will probably find hard because you are self-conscious). Sorry this wasn't that helpful but I tried :/ anyways good look and things will get better