I currently work in IT and am introverted (I pretend not to be at work). Interfacing with customers is very important. I've seen many very technologically smart people rub others the wrong way and it stunts their ability to progress. IT is very broad. I'd recommend figuring out what you like doing. Do you like networking, device deployment, auditing/record keeping of devices, server maintenance, building DB/functions, creating automation, project management, troubleshooting/repairing, people, innovating, teaching, or other things I've forgotten to mention? General small office setup/troubleshooting is easy to start. All you have to do is fix a printer or computer for someone and they will remember you until the end of time. Do it once at work and people will call for you instead of IT.
IT is a growing field, but has issues. For example, a company may spend a million dollars on infrastructure, and expect a $15/hr college grad with minimum training to manage it. Often, managers perceive techs as nerds knowing dark magic, but all at the same basic level so why pay one more than the other?
If I were you, I'd start asking IT friends/coworkers intelligent questions.
Don't say: I want a media server for work. How do I build one?
Say: I'm considering buying the latest Raspberry Pi with a compatible WiFi adapter and setting it up as a slideshow. Does this guide (a guide that you Googled) look good to you? Am I able to FTP or use FileZilla on the work network to upload additional photos? (let's assume that was okay by your employer)
Don't say: Our website sucks.
Say: I noticed parts of our website are not working in Chrome since they are Flash/Java based. I can re-enable it, but what if our customers don't?
Don't say: My printer sucks.
Say: My printer has often shown up as offline on my computer. Since it is connected by USB, and restarting the device or Printer Spool (CUPS if Unix based) does not seem to help, I tried re-adding the printer and using a newer driver. That didn't help either so I bypassed my USB extender and that seemed to resolve the issue. I just wanted to give you a heads up that our USB extenders may cause this issue in the future.
Don't say: What's an octet? What's an IPv4?
Say: Nothing. You've already googled it and are taking a short course on subnetting (if that is relevant to you).
My old boss used to tell me that I needed to be dumb enough to not know when something couldn't be done, and smart enough to know how to Google. Yes, knowing exactly what words to use when Google is very helpful. Capture your interest and perseverance and it won't even feel like work. Most IT folks in my profession get plugged in by being a tech with basic knowledge and working their way up from there. Maybe you can do the same as a contractor?
Hope that helps. Sorry for the wall of text.