Hello there
I'm sorry to hear that you are feeling this way at the moment. It can be really hard to know what is right and wrong sometimes and when you think about it, it can all become very confusing.
It sounds like you are a very caring, sensitive and thoughtful person. That in itself is a very good thing to be!
What is it that is making you question your actions all the time? What is that doubt that seems to be inside you that makes you wonder whether you are a good person or not? It's okay to talk about this and it's really brave that you have written to me, considering how it makes you feel to talk about your feelings. It's okay.
The only way we learn more about ourselves is to talk about how we feel - talking to a trusted adult can be really helpful, because adults have gone through being teenagers too and can often have had the same kinds of questions. They got through it, and so can you.
You said yourself that you feel you are not like what you imagine a bad person to be - that might be the answer to your question right there. Talking about how you feel shouldn't make others feel bad, what is going on for you is important and it's okay to share that. It might actually make people feel really good to be able to help you when you have been there for everyone else.
Maybe you can have a think about all of this and consider talking to an adult you trust - this could be a your mum/dad or carers, or another relative, like an aunty or uncle for example. You could also consider a nice teacher or school mentor or counsellor. These are all people that can help you work this out for yourself.
You did the right thing to talk about this and perhaps you can give ChildLine a ring on 0800 1111 or talk to a counsellor online. ChildLine is here to help and to listen. If your problem is important to you, it's important to ChildLine.
Take care
Sam