"Am I training too much?"
What does your body say to that question? Sounds like a silly response, but, truly, that is what is important.
Listen to your body.
Yes, you can train too much - but it is hard to know about your situation. Are you pushing real hard or just riding to relax? There are folks who commute by bicycle 30-40 miles per day, every day, with no problem. I did htat for awhile, and was fine. But, if you are not used to it, or if it is a "all of a sudden" big increase, then it is not all right.
Besides exercise, the single most important things for your body are rest and proper nutrition.
So, ask your body how it is doing. It will tell you!