Considering your age, you seriously need to speak to your priest about it. He might be able to recommend a good spiritual director for you. If he can't you can always contact a couple of religious orders and ask if they provide provide spiritual direction.
Talking to your parents: I would pray about it before you do. Parents can go either way and by not knowing your parents I can't give a definitive answer. Speak to the priest about it and see what he says.
I think it is wonderful that you are considering this life, but you also need to take your time, finish school and if you can, continue to college or university to get a trade of some sort. I don't know what the end result will be, but at least by finishing your schooling, and having a trade it will help you in two ways: 1) if this is meant to be, at least you'll have some sort of training that can help the order for example if you were trained as a nurse or a teacher, accounting it would benefit many of the community based orders. 2) if this wasn't meant to be you'll have something to fall back on. The world always needs teachers and nurses and wherever you end up, at least you'll be able to find a good job somewhere. Education never goes to waste and you never know how God will use it.
As time goes on, if the calling becomes quite real, you can always contact the religious orders, see what skills they like their people to have. Until you end up joining, it's important to live your life. Date, go out, have fun (within Christian parameters) see the world, go to school, join a young people's group, get involved in the community and go to school. Some orders have young people's groups so you can always join one of those. Singles for Christ, as well as Youth for Christ which are ministries or subgroup of Couples for Christ are great groups to join because members are discerning their vocations either as single, religious or married.
At sixteen the world is open to you so don't rush it. Just take your time and enjoy the gifts that God sends.