"You don't have to boast if you're really worth the praise."
Boasting can be intransitive, and makes your sentence seem more fluently written.
We have a couple of idioms in English that you might like to learn as well. "Blow your own trumpet", or "toot your own horn."
Here's how to use them in a similar sentence.
You don't have to blow your own trumpet if everyone knows how good you are.
It you're worth it, there is no need to toot your own horn.