What are some things you can only do for yourself?

I’m thinking about what it is that you and you alone can do, both in a pragmatic and philosophical sense. For example, you might say, you’re the only one who can put your pants on. You could say, you’re the only one who can decide what’s right for you. You could say we die alone.

I’m not asserting the above are true, just that they are examples of what someone might answer.

Anyway, what comes to your mind as something that you can only do on you own?