Can I choose my feelings?

I have a question.

Can I choose my emotional state?

Can I "direct my feelings"?

There seems that there is a presupposition that I have (and perhaps others too)
that I need a reason to feel good, that I can only feel good if good things are happening around me, that others "make" me feel good.

Imagine if I had a little mixing desk for my emotional state and I could slide it up to feeling good, regardless of the situation around me and the behavior of others....

Choose to feel good....