Whatever you charge then as long as you are getting the experience from doing it and you can pay your morgage at the end of the month then its fine.
One of the greatest advantages of working for yourself is that you get to choose a lot of things. And that includes the price you charge for your time. Its not like being a bus driver, doctor or teacher where there is a set national rate.
Plus also every job you attend will be different in complexity.
Welcome to the forums and as a professional tiler this will become your haven over time.