How can I be a better person?

Just trying to accept the uncertainty and move on.... I don't want to be bad.... I want to be a good person.... But I feel like a bad person sometimes I get horribly disgusting thoughts when I'm angry and think the most horrendous things

Today I kind of snapped and I do feel bad. At Chipotle, a worker wasn’t letting me finish my order and every 2 seconds she kept saying “that’s it?” “That’s it?” Like rushing me, and I yelled, “YES, THATS IT!” I do feel bad because maybe she was having a bad day but I was also frustrated. I do regret it because I need to stay calm in situations, especially because I understand how hard it is to work in fast food, I’ve done it before. I was overwhelmed and frustrated, she kept talking over me and I couldn’t even think about what I wanted next. I’m irritated with myself but I also feel my feelings aren’t wrong, I just handled it in a negative way. Now my OCD has latched on the situation and I can’t stop thinking about it. I feel like I’m an awful person and like I need some sort of punishment, as if having OCD isn’t enough punishment. I did try to call the restaurant to apologize but no one answered. I sent an email with an apology to customer support, I’m not sure if she’ll even get it. I’m having so many ruminating and self deprecating thoughts now. I’m not a terrible person but I feel like I am

I don't really know much I just know I'm suffering everyday