Ignore the local pond life Mr L K Music
He's totally right of course but ignore him anyway.
Seriously though...... I see a classic inferiority complex here.
Don't be so hard on yourself. Try to be kind to yourself and recognise your inner beauty.... Get into the habit of saying "I am a valuable human being"...... "people actually like me"...... "I have many great qualities"...... "I really DON'T smell that bad".
You'll still be a cunt but by deluding yourself you'll just feel a little better about it.
Hope this helps