Don’t be afraid of asking questions and joining in the conversation as a YEC. The important thing is to be gracious and honest in how you approach it. There are some YECs who come onto forums such as this one with all guns blazing only to demonstrate to everyone that they haven’t a clue what they are talking about. But there are others who are prepared to engage with the rest of us in a more informed and gracious manner, and if you can demonstrate a willingness to learn and keep a cool head, you’ll be more than welcomed. As a YEC, you’ll certainly find some of your presuppositions challenged, but remember – Christ is the foundation of our faith, and whatever you do, don’t lose sight of that.
Regarding teaching creationism in schools – I don’t think that creationism (of whatever flavour) should be excluded from the classroom just because it is creationism. Instead, I believe that the position of creationism in the classroom should be based solely on whether or not its claims meet the same standards of honesty, factual accuarcy, and quality control as everybody else. The one thing you don’t want to be encouraging, especially in science classes, is sloppiness or fudging of data – students will go out into the world and end up in situations where that kind of approach could kill people.
Unfortunately, when looking into YEC claims, especially as far as the age of the earth is concerned, I’ve found them to fall far, far short in that respect. The main problem is their approach to measurement: their claims are simply not mathematically precise enough to be meaningful.