Is it me?!?

I have friends. I have a family. However, I always feel alone I could be in a room full of people and still feel lonely. I feel trapped in a constant routine I hate. I reach out to friends and family to spend time with them and we could plan where we'll go the time also the exact place we'll meet but it never works out the plans always get canceled. I feel like I'm going crazy. At school I'm miserable. At home I'm also miserable. At both places I feel like I want to run out screaming at the top of my lungs. I don't know what to do. When I try and talk to people about how I feel they don't understand me and they just brush me off. I feel to boring to be worthy of anyone's friends. I used to think my best friends would help me through everything and understand me bit they don't. I also am tired of talking with them. I'm don't feel good about myself. I think that maybe there is nothing wrong with anyone but me. What if I'm boring to be around? What if I bring my friends and family down? What if I annoy them with my problems? I feel horrible...and recently I haven't let anything out I feel like if I talk about how I feel the people around me will get annoyed...what should I do then??Please help me.