how to care less about things...

Kerrigan
Hi everyone so I was just wondering if I could have some ideas on how to care less about things. I've been hurt too many times and it makes me one of those crazy girlfriends, and I don't want to be too crazy. I get jealous too easily, and start flipping out and I hate that I do that. I wish I could just worry more about things that actually matter. I love to go out with my boyfriend and see movies and go shopping but I always am so insecure when other girls I feel are prettier and skinnier then me are going to catch his attention I've been with him for 4 years now I just can never get over my insecurities they always get the best of me and I wish I could just start caring more about other things... please leave any advice that could help me thank you!