It is so hard to be positive when you are feeling bad about yourself, but its the only way to pull yourself out of this lonely place you find yourself in.
When my husband and i divorced it was really hard to go out and meet people but i joined a jive club - waterlooville community centre, thrusday nite - i learnt to dance, got fitter, made some new friends. There are always jive events to go to, every nite of the week including fridays and saturdays.............. once you can jive you never again have to feel there is nowhere to social and yes you might meet someone, but if you dont , well at least you get to dance and chat to lots of men and women....................
I also joined a walking and social group ( google - inter varsity IVC portsmouth) and we go walking every other weekend.............more fittness.........and more friends............... and they go to the pictures,theatre, plays and out for meals................... they made me feel very welcome.
i joined a book club and started reading more books, so i had more to talk about and am now thinking of starting my own !!!
i chat to people on facebook
i invite people round for meals and have game nights and DVD nites ............. i find people will turn up if you ask them !!!
There are many things you could do - volunteer work, or work in a pub one night a week or do a college course or confidence building course ...................... anything that gets you talking to other people......... making friends, gaining confidence in yourself.
good luck