I would very strongly advice you to get a teacher. I've got a fair bit of sympathy for the position you're in, because I'm largely self-taught. I went to a professional teacher a few years ago, and found to my horror that my playing was much worse than I thought (there's still plenty wrong with it, but with occasional lessons over a period of years, it's an awful lot better, and more disciplined, than it used to be).
There are two great things, in my experience, about a good teacher: firstly, they don't just help you with the things YOU know to be wrong, they help you with the things you DON'T NOTICE but which are wrong. Secondly, a good teacher will develop your ability to self-criticise, so you become much more capable of assessing what is wrong with your playing.
Good luck; I hope you find a teacher who can tidy up your playing and channel your obvious enthusiasm into something more constructive.