There's much that I could take exception to in your post, but others have already done that and the bottom line is that your experience is what it is. We can't (and shouldn't) argue with you, simply because of course, it's real to you.
I'm a nurse of many years experience and yes, like you, I've worked in other fields. But I always come back to nursing. Because there are more people in nursing that I love being around and spending time with. Professional, intelligent, intellectually stimulating AND curious people who make my working day fun. When you can still say you look forward to going to work, even after 31 years doing it, that's a great thing.
But the one thing I do want to take vehement exception to, is your statement that people in general don't respect nurses. In both NZ and Australia there are groups of poll and survey takers. Annually they ask the question of the general public, "Which profession do you think is the most respected?" And guess who comes out top, year after year?
Yep! Nurses. We are held in extremely high regard by 'lay' people all around the world. Maybe it's because they don't see the teddy-bear badges or the floral prints - I don't know. Or maybe it's because the world knows that nursing is a profession of dedicated, committed, highly professional and knowledgeable, not to mention holistic and caring (these words have been around so long to many they may have lost their meaning - but I still see them in my every experience) human beings.
Maybe there's need for change where you come from and are working (studying) as a nurse? But where I come from and from where I sit, the profession is one of, if not THE best. Pay is crap - but very few people come to nursing to get rich.
Hope things improve for you. And I hope you find the inner peace you're gonna need to make all those other irksome issues become unimportant to you - as you make a difference in so many people's lives as a nurse.