Do all disbelievers go to Hell eternally including Muslims with low faith?

I’m a born Muslim. I became agnostic for a few years but I’ve went back to being a Muslim again, alhamdulillah. My family are also Muslim except my one of brothers became an agnostic and the other an atheist. They are still good people and I really care about them but I worry that they will go to hell forever especially when I read verses in the Quran or hadiths that say that. I’m also not a good Muslim myself. I feel like a disbeliever at times or a hypocrite. I told everyone that I’m Muslim but sometimes I question a lot of stuff about Islam (not saying there’s anything wrong with Islam, it’s perfect, its just me that has a hard time believing). **My question is would all disbelievers stay in hell eternally? What about Muslims like me who have low faith or feel like a disbeliever at times?**