This is a no-brainer, these days. Go to University and get a degree. Yes, I know you will hear many stories about how it's possible to get a flying job without one, and some of the less wise here will say that the earlier you get on an airline's seniority list the better. However, they never seem to mention the many who opt out of university and yet fail to get a flying job. Where do they stand in the overall scheme of things? I'll tell you: a lot further down the slippery pole than the people who persevered and got the degree.
As has been mentioned above, there are a great many advantages to going to university, and very few disadvantages. You are young and have plenty of time. Make yourself as employable as possible to as many employers as possible. You could be one of the probably 70% of wannabes who don't make it to your dream job.