More than one question for people that believe in God [Spirituality & Religion]

So a few people on here know I only found my way back to god few months ago. It's still hard for me sometimes to understand when I do something right or wrong, but I also can't understand how other people with faith have so much confidence in themselves that they will go to heaven. Like don't misunderstand me, I don't judge them, only god can, but can we really determine ourselves if we are good enough for heaven? I personally don't care if I was either in heaven or reborn on earth, I just don't want to be lost in darkness.

We are told only Jesus saves and our good works won't get us to heaven, I believe that. But maybe that means that the good works we do don't come from our heart? Maybe Jesus saves us in the way that we do good works because we genuinely care for each other and not to please God? What are your thoughts?

Besides that I also wonder if believers are confident of themselves walking the right path, because I ALWAYS feel like I don't do good enough, can anyone relate? I talk to many Christians and sometimes I feel like I'm the only one struggling to be what God wants me to be. Even if I just have hateful feelings for a family member, I tell myself I shouldn't but I still do and I know I shouldn't judge them because I have made many mistakes in my life too.

I often ask questions to people about God, but I know only God has the answers. You have to be so strong as a believer, because there are people that think you're crazy, weird or manipulated. There are people that just right out reject you if you even just mention God. Yet God is with all of us and walks his journey with us, if we mock other people we mock God too, no? Then there are people I know that go to church each Sunday but gossip and talk badly about the people that are good to them, what's the point of that? Are you even allowed to call people out on it?

Even though I believe, I also wonder how God could care about us when we are just like tiny ants in this big endless universe, because we are HIS creation right? I have so many question, but I can't deny his existence. Because he even saved my husband from death recently (I didn't write about it but he told me a hand touched him and he was brought back to life, he was told his time has not come yet and he has his purpose to fulfill). I don't need God to talk to me to know that he's real, because he has given me so many signs. But there is always the thought 'Am I good enough?' and am I not the only one?