I hate myself. What can I do?

I really hate myself. Ive hated myself for such a long time it feels like ive always been this way. but i cant seem to do anything about it. ive never had a girlfriend, i have hardly any friends, i have no prospects for the future, i'm unintelligent, i'm not at all good-looking, and the list goes on. i acknowledge my thoughts are somewhat irrational, but i still can't prevent them from consuming my mind. im always wishing I could be this perfect person; witty, popular, clever, good-looking, but when I quickly realise i have none of these traits, i get depressed so easily. its ironic because im a very sociable guy. i enjoy talking to anyone, i love to go out, theres never a party im not seen at, but when im talking to people i cant help but feel that they're thinking "when is this loser going to leave me alone?" the few friends i have, i don't think i have that much of a connection with, and sometimes i wonder why they're even friends with me in the first place. my problem is i need constant reurance from people (though i never ask for it). I need someone to tell me constantly, "you're great", "you're so funny", "you're really smart". It sounds pitiful, but I desperately want to be liked. Concerning the no gf issue, i'm too afraid and insecure to have a gf because i'd constantly be thinking, "what does she see in me?", "her friends probably think i'm a loser", and so on. basically i don't think im good enough for any girl (the same goes with friends too). It's a shame I think this way, and as much as ive tried to block these thoughts out, i can't do it, no matter how hard i try. i only hope i can get over this inferiority complex as quickly as possible, but considering I've been like this since early adolescence, the future certainly doesn't look too bright.