If you're not baptized you don't have a lot to worry about.
Do your parents realize that not going to college is a suggestion and not a rule? Many witnesses go to college. Just like anyone there are old school JW's and those who have a brain of their own. Ultimately, too many people who are JW's don't realize that there are only a few rules they have to live by, and everything else is up to their conscience. I'm not sure what it is, perhaps peer pressure, but people who are active JW's have the ultimate decision making power and not anyone else. You have to decide whether you want to go to school or not. If you don't go then that decision is on you no matter what someone else makes you feel. I personally don't care what others think. But I see that many witnesses and ex-witnesses have this belief that they are forced into doing everything they do and that it's the "religion's" fault for whether they went to school, who they married, or how they live. Ultimately, those decisions are yours and you're going to have to live with them. You can't blame someone else when you make a decision. If you are weak minded and you let others influence your decision making that is all on you. Please feel free to bash me, but that is my opinion. It's one thing to not believe in your faith anymore. It's another to blame all your poor decisions on somebody else. You can say you were pressured to do things, but ultimately you make the decisions.
If your parents are happy as JW's they are not going to listen to you and you're just going to alienate them by trying to counter-act what they believe in. Just my experience.