If by musician, you mean using my ears and musical judgement everyday, learning new skills, sharpening skills already learned, and working to reach a new artistic and musical potential everyday, then no, I don't regret that. What I enjoy the least in life is feeling as though I am not growing, not learning, not progressing - and while I believe in learning and I aim to learn as much as I can in all of life, I feel that musicianship is one of the greatest avenues for growth and progress - so when I am not growing, and feeling stagnate as a musician, I don't tend to feel a sense of joy about my life. I don't think anybody enjoys stagnation, regardless of their career path. I think we have an innate desire to live our potential, to discover what that even is, what it feels like, what it looks like, how it works. I don't know that we actually choose that, exactly, even if we are fully equipped with the desires which lead us in that path.
Years ago, I used to ask pretty much this same question to adults that I worked with at the grocery store, the YMCA, etc.. It was always very helpful to listen to what they had to say, not because it changed who I was, but because it helped me to better understand what to look for. There are going to be people who are very good examples to you of what you might consider as reasons to go one way or another, and that will be true in any profession or walk in life.
Topic: Making a living solely as a musician?