Welcome to the forum JW-Matrix!
So to answer your question, yes we all have been faced with the same dilemma you are facing.
Bottom bottom line...you can't live a happy life when you are trying to please others, putting them above your own needs. That will not change. Not only that but you will be resentful later if you give in to the ideas and pressure of others, when it is not what you want to do.
Disappointment comes with the territory. BUT...the stronger and more confident you are in whatever you do will keep them in their place. Remember they want the best for you from their standpoint, from what they know. But if being a JW is not right for you, you will never be happy/content leading a double life. If you commit to fulltime service, or being an MS or Bethelite...it will be so much harder to leave. Life is really too short, and life is meant to be lived. Have fun in college. Go and do and be the person you are meant to be.
I wish you strength for the journey.