Marlene gave spot-on advice.

The other thing I do (I work with kids) is try to give occasional times for them to vent their feelings by modeling it.

For example, I'll say, "Arrgh, I feel so angry because I'm upset about something that is happening at home!" Or "I'm really sad about my dad today (he's passed away). I miss him and sometimes it really hurts."

I often adapt it to what a kid is going through (or what I suspect is happening). Sometimes hearing me say it makes it much, much easier for them to say, "Me too."