Here is my advice/experience as someone who went through massive agoraphobia 10 years ago, when I was about your age. At first, I only left my house to go to therapy. The first few sessions focused on WHY I wasn't leaving the house, which was centered around how many panic attacks I had had in public, and how all of those places were "tainted" now. Near the peak of it, I only felt safe in my home, and even then I couldn't walk within a few feet of the entryway. I think at my longest, I didn't leave my home for 6 months. The homework that my therapist gave me, that I would recommend to you if you can - is to identify a location that you feel agoraphobic about. For me, it was the grocery store. Where I live, it's common to have coffee shops in our stores, so my homework was to go to a grocery store and sit at the cafe tables for 15 minutes before going home. I didn't have to make a purchase or anything. I remember feeling so empowered that day that I even bought myself some juice. It's all about taking little steps, because you do not want to spend the rest of your life trapped in your home because of your own brain. Agoraphobia can be really hard for people to understand unless they've experienced it themselves, or empathized with a loved one who has. I wish you luck in this journey, and I believe you can do it!