Hi!
I am also FTM, and I live in Texas as well!
I definitely relate to the struggle of getting on T as a minor. I have been trying to get on HRT for about 2 years now, off and on getting gatekept by my psychiatrist and at the moment I am desperately trying to find an endo that will prescribe me testosterone in the DFW area before I get kicked out in July. Not to discourage you, or dishearten you, but I have found out the hard way that it's extremely difficult to get HRT prescribed as a minor in Texas- it is hard even for adult trans people to get the treatment they need here. Texas is one of the worst, if not the worst state for trans people. You're heading in the right direction, and I sincerely hope that you're able to get what you need to be comfortable, whether that's blockers or testosterone. Planned Parenthood definitely will not give you any sort of sneeze in your direction unless you're of age where you can consent to a legally binding contract (18.)
Keep on going, stay strong. Texas kind of sucks.
Leo