Hugs and positive energy to you. If those things are what you want** then I hope you attain them. If you feel as though you need to seek inner happiness before seeking happiness through a life partner or a child then I recommend talking to someone about your feelings. I hope you do not feel lonely or ashamed.

And please remember you DO have a family. You said so yourself. Having your own life partner and/or child will be an addition to your already existent family (including your friends and sorority sisters) who love you very much.

Please remember this to buffer some of your anxiety, jealousy, and loneliness.
** It probably goes without saying these are things that you want rather than things that you believe are expected of you. Neither marriage nor children are requirements. They also aren't promises for a happy and fulfilled life.