what I will bring to the company?

What do you say when an interviewer asks you: what you will bring to the company?

(I have no skills or anything)

Honesty?

Enthusiasm (insert some reason why you want this job and are willing to work damn hard) and the willingness to acquire new skills (to keep the job and get promotions.)

I'm good at x, y, and z.

In the past I have done a, b, and c with great results.

I'm a hard worker and a fast learner.

Confidence isn't something that you find, it's something you build and create within yourself. You've got the logic backwards. You don't become confident and then do the things you were afraid of, you do the things you're afraid of while you're not confident and then become confident as you grow.