How can I feel peace in Islam again?

Assalamu’alaykum everyone. I embraced Islam almost 3 years ago. Reading the Quran filled my heart with peace and I truly felt connected to Allah. There was a time when my faith was really strong. I stayed away from online distractions, tried my best to avoid temptations, wore hijab consistently, and spent time reading from trusted classical books. But lately, after being online and talking to different people, I’ve started having doubts. I encountered many Muslims who talk a lot about beliefs and schools of thought. They often label others as unbelievers over differences in how they understand the Quran and Sunnah. What hurt most was how they treated people who left the faith-they were harsh and judgmental. When I questioned this, they said those who leave don’t deserve kindness. It really shocked me and I cried that night, wondering how people can justify being mean when arrogance is such a spiritual sickness. Hearing so many conflicting views has really confused me. My heart feels closed now, like I can’t see the truth clearly without getting tangled in all these different scholarly opinions. I still believe in Allah, the Prophet ﷺ, and the Quran. But how do I move forward? How can I be sure that the Islam I’m following is what the Prophet ﷺ truly taught? I want to believe that Islam is perfect and that these are just actions of some people, but how do I know for sure? How can I rebuild my faith? I feel so numb and distant from Allah, and I just want to run back to Him without associating His words with all these different interpretations. Please, any advice would mean a lot. May Allah reward anyone who helps with good guidance, ameen.