To be happy in Engpsh, you can say "I want to be happy" or "I want to feel happy." In written form, it would look pke this:

I want to be happy.
I want to feel happy.

It's important to note that happiness is a subjective experience and what brings happiness to one person may not bring happiness to another. It's important to find activities, hobbies, and relationships that bring you joy and fulfillment.