Expectations or Unexpectations?

On one hand, expectations can inspire you, but then again, they can really let you down. I've spent the last three years and three months of college with high expectations. I've watched my older sibling, family friends graduate and discuss their great college experience. And I'm a person of experience, I will do something sole for the experience of doing it and saying "I've done that" . It seems as though nothing I've actually done as defined my college experience.
Yesterday I was talking to a friend about my favorite years in college, and it seems as though there was some factor missing from each year that could have made that year better, but nothing is for certain. Freshman year I joined a sorority in hopes of gaining some great life long friends, fun memories, and becoming a better person through the ideals of my sorority.
I guess I've had such high expectations for myself in college. Freshman year was to make as many friends as possible and just get to know different people. Sophomore year was my first year in Chi O and it was my turn to fully experience the sisterhood and what it was like living in a mansion with 50 women. Junior year I was the head of the house out to have a great time and really make lasting relationships with my friends. and Senior year my expectations are to make every moment count with my friends. Now these expectations don't seem too out there. They seem pretty much in grasp. The hard part is , is that they are so out of my control there isn't much I can do about it.
I guess I'm tired. I'm truly tired of putting so much of myself, my beliefs, passion, time and energy into an organization where no one cares what I've done, or who i am. I spent most of last night on the phone with my big sis contemplating what I've gained from this experience, and whether or not to stick with it. it was hard to find physical evidence of what I'm taking from this. I devote so much to this organization, when I could focus my energy elsewhere into something that will give me something as an outcome.
Its true, my expectations made me want to be a better person the past three years, but I guess the simple tasks was too much. My expectations truly let me down.