I just recently joined (again) gamedev.net lost the password and email for my last account, I signed up on 2009 when i was about 10 or 11 and programming was something I always tried to do but din't understand that much(maybe it was my small brain ) I came on and off in learning Until I actually bought c++ books and a SDL one too. But I never got to really learn anything out of them. But what I do like about me going early into learning programming is that I know most of the concept and syntax of the language, either way its been years and I forgoten But some of the knowledge still remains.
If you want to stick with C#, OpenTK and Tao might be something you are looking for, but I have no experience with them so I can't actually tell if they are any good (I simply googled C# + OpenGL).
If you want to use an engine, or rather just a rendering engine so it still leaves a good chunk of gameplay programming for you to do, perhaps the C# wrapper for Ogre3D is something you might like: MOGRE
If you don't mind switching to C++, there are a lot of resources available for both DirectX and OpenGL on the web and in books. Just a simple google (or search here on the forum) will get you on the road rather quickly.
Not to put too fine a point on it, but do you really "like taking the long way in things" as much as you think you do? Do you honestly think that programming is for you, considering the fact that you can't seem to stick with it? You bought books, but they taught you nothing. You take years off before coming back to it. It sounds like it just isn't something that holds your interest for long. And that's fine, there's nothing wrong with that. But there just aren't any magic tricks that are going to suddenly make you good at programming games. No special toolkits, no frameworks, no books. If you are not programming every day, then you aren't going to advance. And if you can't be arsed to program every day, maybe you should stick to frameworks like Unity, or focus your energy down those paths that do interest you.
Of course, you are also 13 years old. So don't worry too much about this kind of stuff. Just keep learning and doing things, and if this really is something you want to keep doing, you'll get better.
@Reloadead_: Thanks for the reply, will check that out.
@FLeBlanc: lol, im 15 now. I get what your saying that since I quit so many times am I sure I won't lose interest again. And your question about what I trully want to do. Well my answer to that Is yes(as a hobby), and that reason for me quiting learning so many times before was becuase I had very little time, I also din't know english that well since I came here when I was 8 but at such a young age my expectations were high and my goals were to fast for my little knowledge. But like I said , now that I know what I really have to do in order to achive those worthy goal , I can progress without questioning if im going to be quiting any time soon(which im not). Hopefully that explained more on what I was trying to say. Btw when I meant any frameworks like XNA i meant what Reloaded_ suggested me which is fine. But thanks again for your reply, made me reflect in the pass alittle bit.