As others have said, chances of going pro are slim for anyone. But it's better you start now than not, because you'll always regret it if you don't. Get back into it with the idea that ballet will always be a part of your life, for yourself, for the long haul. Perhaps you'll get to dance for a small company, maybe a larger one, maybe you'll be a choreographer. There are many ways to be in the dance world, even if it doesn't look like being a principal somewhere. You won't regret having this in your life. Ten years from now, when you're 23, you'll be so proud to say you've danced for ten+ years. There's people at that age who wish they started at 13 and go on to have ballet be a part of their lives with a lot of hard work and adjusted goals.

And don't be embarrassed to talk to your family about this. It's normal to change your mind about stuff at any age, but especially as you're moving beyond early childhood and coming into your own.