Learn a marketable skill
College/university is great for this. So is the internet. Your mileage may vary depending on the subject material.
Work on a portfolio
Again, YMMV depending on the type of work. That being said, the idea is to hone your craft, even (read: especially) in your spare time. If you can show off projects that you've worked on that demonstrate your skill set, that's a foot in the door.
Find employment at a place that could use your marketable skill
And I mean any employment. I'll use myself as an example. If you want to be a programmer, then make sure you work for a tech company that employs programmers, even if it means you come in as a Level 1 Technician that does no coding.
Continue to work on your skill set, and be assertive in volunteering to work on things above your pay grade. Particularly on things that might lead to your desired profession. Also, don't be afraid to jump ship if a better/more promising opportunity presents itself.
None of these things are easy, but it's all possible. I've dropped in and out of university for over a decade. I barely have an AA degree at this point. I wanted to get into software development, so I worked on those skills in my spare time. I started at a small tech company a few years ago as a temp, made it to full time as a support tech, moved into the networking side of things, into R&D, and when a position opened up, I applied for a software developer position.
On paper, it was a level 2 position, where they were requesting 3-5 years of professional experience in various technologies, alongside a BS in Computer Science. I had the experience, but it certainly wasn't professional or documented, and I certainly didn't have the degree. I applied anyway. I was vetted and tested alongside all the other outside applicants, and from a dozen candidates I managed to test/interview in the top two. My boss basically sat me down and told me, "it's a coin flip between you two, but I'll take the employee I know before the one I don't", so I was hired.
I'm certainly not the only person to make it happen without a degree. It's hard work, but it's possible. The key is not to tie your ongoing education to your attendance at a university. Keep plugging away with every avenue you have (read: the internet), and hone your craft. Work hard to put yourself in a position to have your skills recognized. You can work your way up.