Casual Sex

I've found that since breaking up with a long term boyfriend in February that I've jumped between casual relationships. Although I've acknowledge that they can leave me feeling like crap once they've burned out I just go on to the next one. The last few flings I've hoped would turn into something more meaningful, which of course never happened. I just feel that I'm addicted to the feeling of being wanted by someone and need to give up on these casual flings/any relationship for the time being. I know it sounds stupid but any tips on how not to feel so alone and single?