That thing isn't worth it at your age!
Get something you can be aggressive on, and throw around a little. Unless you're 6'7" and 350 pounds, that bike isn't going to be anything remotely flickable.
Pick up a used 250 two stroke. It will have WAY more than enough go, and be a lot cheaper to repair. For the power they put out, the two stroke 250s are very light, and have better suspension. Parts are available for them everywhere, whereas you'll have to look for quite a while longer to find parts for the DR650.
Once you also get your license, you can sell the 250 and pick up a dual sport, or an older street bike without losing much, if any of your invested cash.