Regarding enjoying life:
As a high school student, schooling is the primary thing in life. In my case, I enjoyed my life through the school works. Receiving good marks made me feel great and it was a kind of achievement. That's the kind of life you can enjoy only when you are a student.
Once you leave the school, there will be different things to enjoy. But for now you simply enjoy the school things as much as possible.
Regarding the ultimate goals:
University is not the ultimate goal. It's a step further towards a successful life. There may be many different types of successful life, but with better education, the future life will be definitely more enjoyable.