Most of us have wasted some time in our lives. The younger you are when you "wake up" the easier it is. But (as they say) it's never too late.
Personally, I wouldn't look back. You are already in college and that is where the grades really matter. Even if you are in some classes that you are not interested in, take them, study, and ace them. Nothing is that bad that you can't learn something, and apply yourself. After a few general courses. a student with great grades can transfer into the specialty that is of interest to him - even if you need to change schools to do it.
With any luck you also have an adviser that can help you plot the probably course. Take advantage of that free career counseling. If your adviser is a dummy, find another one. To find a member of the faculty that you can relate to (and that knows all the ropes) is an honorable quest.