Hi Marissa!
Definitely have been there myself. It's not uncommon for Crohn's flare-ups and depression to go hand-in-hand, so I'm not surprised that you feel like you are somehow a burden (even though you are not!). I felt the same way. It took me a while to get both my CD and my depression under control (again, probably related), but you will surely get back to a sense of normalcy soon. Humira may help you quite a bit, but if it doesn't work right away or if it's not the right treatment for you, don't lose hope! As far as getting your feelings under control: everyone is different, but I certainly found a lot of value in going to a therapist, and I now I'm taking an antidepressant (something I managed to avoid for over a decade). That said, I feel much better now, and I'm sure you'll get there. Remember, you have NO REASON to feel guilty about this sort of thing. It's not something that you chose to bring on yourself! Keep that in mind, honestly -- it makes a world of difference, I swear.
Also, keep in mind that you are probably stressed about starting college as well, which doesn't help matters much. I was super stressed about my job when I was first diagnosed, and I know that didn't help me think all that rationally.