How to delete my WordPress account and start over?

Hello,

I joined WordPress a couple days ago and plan to create a website for my business. I am super excited, but when I created my user name I was on the phone with my Host who was walking me through the process of set-up so I quickly created a short username thinking I could change it later. Much to my dismay I cannot change my username.

After discovering this, I read that basic usernames open you up to hackers. If I had been warned that the username could never be changed I would have taken a moment to create a complicated one. Please help! I just want to start over.

So far, every forum I have read on this topic feels like people are offended and self-defensive about asking such a simple question so I really hope I can get some gentle and positive responses to my dilemma.

Thank you.