You should not worry about what others do in quilting or otherwise. Believe me, most of us would love to be more like you! I am a seamstress from years gone by and always have had more than one project going at a time...mostly due to too much happening in my life. But you are fortunate to be so focused and directed to be able to accomplish one important project at time.
Anything we do in life is a gift...something to grow with and to learn from. Whether for ourselves or being made for someone else, it is a really valuable process for us to appreciate and enjoy. So hang on to that thought and enjoy every moment and project.