You sometimes encounter people who are completely wrapped up in themselves. Whatever happens, their first thought is, "How does this affect me?" For example, you fall and break your leg, and the other person says, "Oh no, now I'm going to have to take you to the hospital and we're going to be there for hours and I had so much I wanted to get done tonight" — and meanwhile you're lying on the ground, writhing in pain. Or, you come home and tell your family you've lost your job, and your teenager says, "You're still buying me a new cell phone, aren't you?"
If you want to show off your vocabulary, you could call this type of person a narcissist. Or, the phrase that's often used today is, "I guess it's all about you."