Jannah is the ultimate reward that Allah has prepared for us. Just because we are Muslims, it is not guaranteed for us. We need to strive and work hard and hope for the Mercy of Allah. If Prophet Muhammed and the companions struggled and would fear if they would be saved from Jahannam or not, where do we stand brothers and sisters?
Prophet (ﷺ) said: “Paradise is surrounded by hardships & the Hellfire is surrounded by temptations.”