But you should just try to achieve doing something that makes you happy.
Making boatloads of money, the next Google, or some other goal that 1/10000000 people would ever achieve is not the be all end all of it (if it's even a valid life goal).
I learned coding within the last 2 years or so, and before that I had felt quite as you did. I dabbled in Visual Basic at 14, but then I came upon this huge wall of C++. I couldn't grasp OOP and it's weird Cat cat = new Cat() for the life of me, and I though I just wasn't smart enough, so I stopped playing with it until recently. In the last year especially I got comfortable (and grew to love) the command line, git, vim and a bunch of technologies I thought I would never have the patience or diligence to wrap my head around. Really the last year has got me so far. You can do a lot in a year's worth of spare time, if you can find a practical project to motivate you.