Jealous of my sisters career success- and concerned about my own future career?

it seems to me your sister has just found her way right out of the gate and you haven't. so it is making you feel a bit inferior but your not you will find your perfect job and perfect someone. give it time .and remember this she was out of collage before she found her perfect job for two years. you are still working on your degree , stop selling your self short you have time.