What's the right thing to do as a junior dev when your boss acts too intimidating and gives you feel like you are unwanted?

Start looking for a new job. Really... You don't deserve that.
Your boss has an attitude that is toxic.

That boss can ruin your health thus your life, so run. Run as fast as you can and don't look back. Amazing things/jobs wait for you.
Just do it! (C) Nike

@Synti Thanks for the motivation. Yes. Whatever happens, I don't deserve to be ill-treated.

I directly told him how I was feeling by his behavior and asked what he wants actually. He was so humble and apologized me saying that he personally was frustrated and that resulted in such outcomes. Also told me to never feel unwanted.