I feel so useless and insignificant?

Im in high school and I feel so useless I'm not good at anything...I'm like average for everything I do it seems! When it comes to to athletics I'm average, when it comes to school I'm pretty much average, socially I'm average, and I don't feel very important. I feel like I don't have much to offer to this world, but I for some reason have this strong sense of wanting to help this world and i don't feel like I can really offer that much...does anyone else feel like me?