I agree with what it's been said.
You've learned because you enjoyed it and had fun with it. And that's great. But, even if you know a lot, in this world you will have to go on learning... forever!
Not only to keep on improving as a designer but also you need to learn about business
So, yep, keep on learning and start to create a website, something that you can show. It could be yours (why not? You should have your own website)
When you have something to show, things are easier. Fake companies could be good too.
Doing a real project (whether it is your own web page or some fake companies) will show you the problems that you could be facing with a real client. Even if you will not code it yourself, and you need help for that... do it!
Participate in competitions like in 99Designs.com to gain experience and get feedback.
And when you're a bit certain that you have something to show... Offer your services. Pick one or two companies and offer to improve the design or re-do their website for a fair price.
Be sure that you don't make promises that you can't keep. Always over deliver. The word of mouth will start to roll.