I thought i would step in and say something.
You should sit down and think RIGHT NOW what you want to do in art and why. Not career or watever but what kind of artist do you want to be?
Once you figure it out, go and look at what it takes to be that artist and start practicing what you need to practice to better your skills. Doesn't matter if you ever reach that level of skill, just do it.
Now i will add something. if you want to be a manga/anime artist. I know for a FACT from people who do that stuff in industry that you need to have a strong understanding of anatomy.
So think now what you want to do and really be careful, the more pictures you draw the more your eyes, mind, wrist and arms get acustomed to how you draw and the more likely you are to develop bad habits if you don't do the proper exercises to train yourself and better yourself as an artist. By drawing anime without proper knowledge of anatomy you are developing bad habits from the beginning. Its great you like drawing, i'm not saying to stop what you like. But you need to sit down and teach yourself how to draw anatomy and human beings before you can break what a human being looks like as an anime character. People in industry says it really hurts your career if you visualize charecters like anime characters instead of an actual person. By doing this you limit what your capable of drawing and by limiting that you also restrict your future oportunities.
People who train and learn how to do anime don't just start drawing anime (some do) but if you go to a school for it they will sit down and make you draw people and realism till the end. Once you have a high understanding of proper anatomy they then begin making bridges and showing how everything relates and how you can take your lessons to more easily draw anime.
Just remember, everything you do at an early stage in art is going to stick with you. If you get a negative critique and you find truth to it. Work on fixing that issue as soon as possible, unless its something you don't mind developing a bad habit for. So basically my only word of advice is, find resources can be anything and really learn what it takes to be good at art. Then take the steps you need and do the work and practices you should in order to improve your art in the direction you want it to go.
Last but not least, have fun. If you enjoy your art people will notice. If you simply want to just have fun and improve along the way dont worry about how fast you improve you have no career in mind. Take it slow, make it so you understand what your doing and always remember, you have your WHOLE LIFE to learn art.