tubes tied-too young?

hello ladies, i just turned 22 & i have a 3 year old son. at this point in my life i want to focus on law school & becoming a lawyer and even though a baby won't stop me from achieving my dreams i dont think i want more babies lol. i have not seriously spoken with my partner (my sons father) but im scared if i tie my tubes he will change his mind eventually. i live in new york & i'm not sure if there are age restrictions & i asked my mom but she's pressuring me to have another child.