I knew my girlfriend this year and we started a relationship so fast, but i have a really problem with jealous, she's get into the university this year and knew a bunch of different people, most of this people are more beaultiful than me, have more money than me and are more smart than me, i really can't stop thinking in she replacing me in any moment, this give me a pain that i can't describe, is a pain that hurt physically, i don't know what do. I'm a selfish?
People act like feeling jealous and insecure are great sins but they are natural emotions. It's OK to be a bit selfish in this context and to establish limits around who you're comfortable with her being around or what she should be doing, and if she refuses then you can break it off.