From my own experience I think it certainly is normal, autism or not. I only recently thought I might be an aspie but I can't make up my mind; all the social problems certainly resonate with me, there are other things that don't however. It doesn't help that it's harder to find information that's only about women.
To get back to your question, it's common for people to tell children that they're living through the best years of their lives but that's simply not true. Children's lives are based around the whims of other people. Such whims are often arbitrary and can be based on negative emotions. Imagine a dwarf wearing a cowboy hat dropping from your ceiling at this moment, producing a banana that he thrusts at you in a menacing way, and ordering you to clean your ears NOW. RIGHT NOW. NO, DON'T BLINK. CLEAN YOUR EARS.
That's what it's like to be a child. At least, that's what I remember of childhood. Not literally, of course.
I think it's natural to enjoy the freedoms that being an adult bring. The responsibilities can certainly be heavy, but I think the little things like being able to choose what to eat or when to sleep can make up for them to some extent. Control over the little things makes us feel more secure when we face up to the bigger ones.
I'm glad you're feeling happier these days.