This is your life so live it to the fullest. All grand expectations may not be met but you never know how far you will go if you don't first try. The journey's you take will be meaningful regardless and sometimes the mishaps that occur turn out to be the things most memorable and may lead to unexpected surprises.
My personal feeling is that many people look backward to recall a "best time of life" because it was a time where personal judgments were limited. We didn't really care as much how others judged us and likewise, we refrained from being so judgmental. As we age and form more relationships, we gain the risk of more opinion to our actions and of placing more opinion on the actions of others. These burdens of judgment come to and from our boss, our spouse, our co-workers, our neighbors, and so on. Before we know it, we totally conform to the way others want us to be and we place constraints of conformance on how we want others to be. For both reasons, we lose some of that light and airy feeling we once had. Hence, the best of times where we felt free of mind are gone.
Recapturing that sense of freedom can be accomplished and does not have to be that difficult. On your own time, you should be able to enjoy doing those things that make you feel young and free. As long as you are kind and respectful to others and not hurting anyone or breaking any laws you have the freedom to do those things that make life fun and enjoyable for you. Likewise, you must let others do the same if you really want to feel good about life.
Free the judgmental clutter against your own self and that of others. Light and carefree feelings of existence will return. The best years of life are when life is fun and enjoyable. The best years of life are yours to write. Start that new, and better, chapter today.