Generally most people seek a psychologist when they are having trouble with things they can't figure out on their own and need someone to talk to who can give an honest and educated answer too. I am just guessing here but I get the feeling your mother did this thinking that it could be a phase you are going through and that maybe the psychologist can straighten you out. Way back when, in the olden days, parents would take their children to doctors and just say "fix him/her".

A good psychologist should work with you to help you move forward and get past any hurdles you need to get over. The one thing I would suggest is ask this person if they have any experience working with Transgenders otherwise it would be a waste of your and their time unless you just want to talk about normal every day stuff that is bothering you.

Something else to consider is that what is said in that office stays in that office so don't be afraid to talk about anything that you would might not talk to others about. They are not their to judge you, they are there to help you. Just breath and be yourself.

Agreed, there is a big difference between what a psychologist does than what a gender therapist specialize in.

What your friend told you is correct. The first session is going to be mostly a "get to know you" session, maybe some paperwork and that sort of thing. It usually is not until appointment 2,3, or 4 that you really start getting into anything. Remember you are only going to be in there for about an hour and that is not a whole heck of a lot of time for them to really get to know anything about you.