I struggled with these same issues. When I was younger I would atarve myslef to be skinny. It didnt help my self esteem. I still felt the same way about myself. I had to work on my inner critic. That little voice that tells you your ugle, useless and wont amount to anything. You have to tell that voice to go f*** off and then tell yourself I deserve to be happy.

I reccomend eating healthy. Fruits,veggies, natural food. Exercise helps me. I don't exercise to be skinny, i exercise for me. Exercise makes me feel better and like Im improving myself.
To meet people you have to take the risk and go out. There are a lot of men in this world and Im sure there is someone out there that can think you are totally awesome. The trick is to get the courage to meet people. Tell yourself that other people can like you. I hope this helps.