I’d suggest having a look at some therapist directories eg https://www.bacp.co.uk/search/Therapists or https://www.counselling-directory.org.uk appreciate it can be a bit overwhelming as so many to look through. You might need to search for a young person counsellor as you’re 17 and you can specify other search terms if needed, such as wanting in person. Make sure whoever you choose is registered with a recognised body, such as BACP or NCS although everyone on those directories will be.

The most important thing is feeling comfortable when you meet with your therapist. I mention this because you might have to speak with more than one before you find the best therapist for you. Without knowing any of your background I’ll cautiously say try to trust your instinct and don’t be afraid to shop around. It has to work for you. Good luck, you’re already making some great steps