So many worries

I have sinned many times, but at first I didn't know it was a sin, and I'm trying to stop, but it's hard. And I'm worried that He's mad at me, or annoyed. But then I tell myself that He'd forgive me, but then I start to worry that I'm just being too easy on myself, and He probably isn't. How do I know if God is angry with me or not? Or does He get annoyed with me? It scares me to think that, but...