Sorry to sound harsh but you spent a lot of time, energy and money studying for a PhD in something you don't sound in the slightest bit interested in. I, as an employer, want people who WANT the job. It's a huge part of your life - work - pick something you want to do.

A PhD is not a waste, but it will be valuable when you are senior and getting anywhere takes hardwork, attitude and enthusiasm.

If IT does not excite you, find something that does. Life is too short.

Hi Kathryn,

I am senior in the IT industry so could offer my opinion if you gave more information on the type of roles you are applying for. Like most industries no experience = starting at the very bottom (even with a PhD), I hope you don't think that is beneath you. But you clearly have the ability for a high level of commitment and could/should rise quickly.
When hiring if the role is junior the mantra is - hire the attitude train the skill. That might be the bubbly personality they are looking for.
It's only an interview.. practice it.. nail it. If you can do a PhD I have no doubt you can learn how to ace an interview.