I'm going to apologize here for the amount of text. Also, I'm not a lawyer, therapist, insurance agent or related professional.
Personally, I was recommended a therapist through my church. If you would like that option, perhaps say that to your legal guardian or your pastor, whatever you prayerfully deem the best. You could even explain to them, if necessary, that pastors often have a wider skill set -- caring for souls, biblical interpretation, speech writing, perhaps business and management concerns -- whereas you would like a Christian therapist/counselor who just specializes in therapy. That's all they do and they're hopefully good at it.
I don't know about Chicago, but it is a larger American city so you've got fair chances of finding a Christian counselor. I would warn you about telling other people in your church/school about this though; I've seen secrets spread painfully.
Additionally, and I say this with hesitation because they are likely to have a significantly different worldview than you, but professionally-trained Jewish, secular, and other religious therapists may be able to help out. This option should be well-thought out and prayed over before doing.
All of these things considered, good therapy is often quite expensive. Luckily, however, different therapies may be covered by insurance, so if that lines up, that can significantly diminish the price of the services. It may be a long shot, but perhaps some free church, volunteer, or civil therapy services can be provided. Just ask around, or impress to your dad or your pastor that you're interested in this. Keep in mind that these are free services and may carry higher risk and failure rates than the pricey ones.
Oh, also - school counselors. I'm not too knowledgeable here. Use your best discretion, talk over it with someone you trust, and pray over it.
Keep in mind your safety; anyone in this position is inherently vulnerable at this point, so don't be a dummy with any of these people. You're here to get help but, if necessary, stick to your guns (metaphorically). Finally, I had a therapist that was great and was borderline worth the incredible amount of money he got paid; however, some were bad, so don't get discouraged at the first one.
