Thanks for taking the time to reach out. Your message is really short but you definitely get the point across that you've been really struggling lately with self-esteem issues and a negative opinion of yourself...that's really tough to go through. Reaching out to other people and getting their support, encouragement, and comfort can really remind you just how important, cared about, and appreciated you are. Its tough to carry around negative thoughts about yourself which is why opening up with people who you know and trust can be such a valuable thing to do.
Feeling better about yourself really is something that is within your power. People are our own biggest critics, we all do it to ourselves. Getting a healthy, outside perspective from a friend or family member can really go a long ways to point out just what a great person you are. Here is a link with some suggestions of things you could do to feel better about yourself: http://www.yourlifeyourvoice.org/DiscoverIt/Articles/Pages/FeelingBetterAboutYourself.aspx
i do not know for this is a very short description..but i believe its because people are bulling you and your self-esteem has been going down. you need to keep your head up, know you are very important, and think of all the good things about yourself! Don't hate just love..because love dominates hate in the end..