How do I know if I'm a good muslim?

I've been trying to stay consistent in my prayers however i do only end up praying 2-3 prayers only. I've cut many of my bad habits. Sometimes i get these thoughts about things I don't wanna think about. I've been reciting ayat ul kursi every night too. Yet it still feels like I'm something wrong. Like I am the worst muslim. My life is not at peace. I get bad headaches and my heart starts beating fast all of a sudden. What am I doing wrong?