AE can get fairly complex quickly.
Every few years I take a class in it at the local community college, mainly to get familiar with the newer upgrades that are available. The classes are not college-credit, but more like night-school for adults looking to learn/improve new skills. There's no reason why you couldn't take courses like that too, even though you're fairly young. There's been teens in some of the classes I've taken.
Before that, though, read up on what the real differences are between editing software and motion-graphic software... 'cos while they do have some similar qualities, they are very different tools.