Dude, no school will make you learn art, the thing school might do to you is make you procrastinate less and practice more, which is what you need to get good at art. Today theres the internet, the only thing school will do for you that you cant do alone is networking with ppl in the area you like (which IS in fact important).
Plus, this style of art (the one you posted) requires more time to produce, GENERALLY a sane person wont do both programming and art aiming to THAT kind of art, cause it take a big deal of time to produce. For example, skull girls took 4 years to get done (if I remember correctly), and had a team of animators. But its not impossible, if I again remember correctly, theres a japanese guy who made a fight game in MUGEN and he did all of the fighting girls characters, all super high pro quality, pretty insane (sorry, I dont remember the name).
Dust an Elysian Tail was made by one guy, he was into animation first, than took a book on xna and made his game.
Its possible, but ppl who make both programming and art aim to more simple stuff, like Spelunky, Cave Story. Its more realistic. Take that into consideration.
Now you already 19, if you have such interest in art, how is that you didnt keep practicing? I never saw anyone getting good at art fast, most good artist I know kept drawing from a very young age and never stopped. I cant guess how much time, but keep in mind it CAN take more than 20 years. Maybe it can be impossible for some ppl?
Why dont you aim for building a team? Its my impression that most indies have 1 artist, 1 programmer and a freelancer sound artist.
If you actually enjoy drawing, than it will never be a waste of time or a bad decision, have fun and keep improving together with your programming skills (try to find an artist to make games while youre not satisfied with your own art). Dont go for something that might be just struggle for years and yet you might end giving up on it.