Good point here. Satisfaction with your life doesn't have to = satisfaction with vet school. This is a means to an end, and loving vet school isn't a necessity to being a good veterinarian (or even a good vet student!).
Pre-vetters, don't get discouraged by our discouragement. It's hard, but so is being a pre-vet and doing anything else WORTH the effort. You will encounter challenges in everything you do, and you will not love every moment of your life, but that doesn't make it any less worth living.
If the things said in this thread (and every other c/o how ya doin') thread concern you, I offer this recommendation: work on things NOW. If you don't exercise enough and know you'll eat bad food and feel unhealthy in a stressful environment-- build up those coping skills NOW. If you procrastinate a lot for studying and have a hard time keeping up with work, practice better time management NOW.
You can prepare yourself for this. You'll never be perfect, but it really helps to come into vet school with a "coping" toolbox. Figure out how to manage yourself and your stress, and you'll thank yourself next year. It might not be a birthday party every day here, but you can survive and like Scb44f said... even be happy!