Let's take one area of "study" that you have done... and see what the process was.
You studied how to post on Psychcentral. WHAT?? You say... yep. Even if it wasn't conscious, you studied.
When you came to this site, what did you do? You read. Maybe it was a few posts that interested you, maybe it was a need to put your thoughts some place where people would understand. That created a motive and a need: a desire to do this.
You read the instructions for signing up, you read the agreement, the TOS and did it---and you had never done that before HERE at PC had you? But you learned how and you did it by reading, studying, and following the instructions.
But then you had to figure out how to post. Maybe you did that on your own, or maybe you had learned that at another site, or maybe you were able to ask for help somehow and another gave it to you. You learned how. With time, you have "studied" and learned better how to use the site for your own interest, yes? You might have seen others put smilies into their posts and learned how to do that yourself. Things like that are a result of study.
Bigger issues require more study though. Some issues are really complex and you need to learn the "basics" before moving on to the more complex.
I would suggest that you find something you are interested in, maybe a hobby, and begin to increase your knowledge about it, your understanding behind it. That will require reading and "studying". It won't seem so much like studying if it's something you are interested in though.
It also doesn't have to be "book knowledge". Perhaps you learn better by the "hands-on" method? You don't want to read a book about a certain topic, but you would like to talk with someone who knows it and can show you "how to".... that's a form of studying as well.
Getting a driver's license is a good goal; it requires you learn the rules of the road and safety and legal requirements for the vehicle you drive. Some of this you may have learned from watching a parent or relative or an older friend. You might not "know" this, but when you read the manual for the written test, you realize it--there's stuff you already know! You have to do a driving test... and while watching someone else, and helping them drive (there's a stop sign up here---wait there's a car coming!) you still have to sit in the seat and learn how it's done by you! That's studying too.
So I think that you need to just find out how it is that YOU learn best...and how YOU enjoy learning things... and then studying won't be a chore so much (hey, calculus is still a bear to me!) and you won't
feel so dumb.