My wife wants to go to law school and I don't her want to go.
Seriously? Why don't you want her to go?
If she becomes a lawyer in the future I may be in her client list.
If her dream is to go become a lawyer then you have no right to stop her. It's controlling to try and stop someone from following their dreams.
I'm worried if she becomes a lawyer too that she will be better than I am.
Well even if she is, you should still support her. And if you're worried about her being better than you, then you should practice, maybe you could practice together!