Hi YongSun, welcome to Psych Central. It's not bad to talk to yourself, a lot of people actually do that, I read it's a sign of intelligence. Also, keep in mind that we are actually our own best listeners too. It's also not strange to suddenly think of something that's funny and laugh either.

Our brains are taking in a lot of information, more than we realize yet, if you think about it, that is actually what our computers do too and we designed computers to be compatible with our brains.

Also, just because your brain recalls in a voice a message that you have received (we also definitely take in a lot of messages each day too), this really doesn't mean that just because you experience this that this message is true and you need to act on it. Keep in mind that we see a great deal of advertisements trying to get us to purchase things, yet it doesn't mean we really need to suddenly decide to purchase the things we see advertised.

It sounds like you are still young yet as you are living at home etc. Well, it's important to understand that a human beings brain doesn't fully mature until around age 25. Also, a human being goes through hormonal changes and that most definitely has an affect how a person feels and reasons as well.

Also, it is possible to tickle yourself so I don't know where you heard that it's not normal if you can tickle yourself.