How can I get into this field? I used to love doing pen-testing when I was a teenager, and paid for my first car out of bug-bounties. Unfortunately, I got distracted by girls and booze at university and didn't keep it up, now I work in sigh enterprise C#/WPF land.
I believe what helped was a handful of personal projects related to security: reverse engineering firmware, finding bugs in web apps. Also I emphasised the parts of my software development work that had some overlap, such as debugging Windows kernel drivers, and doing security reviews of network services we were writing and deploying.
Now I'm doing full-time vulnerability research and writing software to help do that. Much more enjoyable and pays better too.