Become better guitarist?!

Become better guitarist?

I have become better since i started playng 1 year ago but i see other kids at my age play in more advance level than me I am like a good onw but not the best. I love playing guitar and play 3hours each day. But How can Improve to play perfectly songs like knocking on heavens door?
I was thinking should i learn first classic music(cause i Have seen many report slash and others first leanred classic music)? what songs? ps i do not recive class just by tabs

You are making a mistake that many "new" players make. You should not learn "songs" so to speak. What you need to learn is how to recognize chord progressions and how to apply them to many songs instead of just the one you are learning. You should also learn how to play your scales. It's boring, I know. But your fingers become more agile when you play scales every day, and that's how you teach yourself how to play the little licks and chops you hear in songs like Knockin' On Heaven's Door etc.

Learning a "song" before you do these fundamental things is sort of like trying to build a brick wall starting from the top. It aint gonna work without foundation.