Assalamu alaikum - Does anyone else fear they might end up in Jahannam?

Assalamu alaikum, I’ve been carrying this heavy worry for years and wondered if anyone else feels the same. I keep feeling like I’m probably going to end up in Jahannam. I’ve been trying so hard to stop this major sin, but I keep falling back into it. I wasn’t born Muslim, and practicing Islam has been the most difficult thing I’ve done, even though the proof that drew me in felt undeniable. Some days I honestly wish Allah had never created me. This struggle has been with me for about five years now. What I’ve realized is this: you can keep praying, fasting, giving zakat, and doing sunnah acts, but Allah knows what’s in your heart. He knows who truly accepts the way and who is still struggling. I’ve made du‘a many times, begging Allah to take my soul back because I can’t find peace. Since reverting I’ve never felt this much anxiety. The hadiths and some verses I’ve read terrify me and make the fear worse. I’ve read up to Surah Yusuf in the Qur’an, and some ideas in it feel so overwhelming. Some days my thoughts get so dark I try to reason out little ways to lessen the punishment in my mind, which I know isn’t right, but that’s how heavy my heart feels. Before Islam I felt sure and calm in my old faith, and then when I encountered Islam in a way I couldn’t ignore, my heart sank with a sadness I’d never known except maybe as a very small child. If anyone has gone through this - feeling like your iman is present but your heart is heavy with fear of Jahannam - please share how you coped. Any sincere advice, du‘a, or reminders of Allah’s mercy would mean a lot. JazakAllahu khayran.