im not in a great spot right now, how do i get out?

as long as i can remember i have hated myself. I always try to succeed at an interest of mine but it never works out. Theres always something i find wrong with myself. I try to make myself feel better, like recently when i felt fat i started running all the time. Now i can run a 5k pretty quickly but i havent gotten any slimmer and i just feel bad. I never have the courage to ask anyone out. In the past, like any human, i have grown to like someone but i can never find the courage to ask them out. A lot of times i stop talking to them as well because it is so hard. I tried to make myself fell like i had a purpose by enrolling in debate, doing community service, and becoming part of national junior honors society but i dont feel any better. Im just scratching the surface here, but i just am never happy. IS there anything i can do to make myself feel better?