The_Little_Kid i know exactly what are u going through.... all that crap about beeing to young...
I am 20 now. I told my mum when i was 14-15. And ever sice, i've been hearing that i am too young and still developing pschologicly, that puberty is not over jet (which is false, unfortunatly) and that i need to re-think and re-consider it. I have seen several (inexperienced i might add) mental health professionals... one of tham even 'diagnosed' adolescent crisis

and the other asked how i feel when i do housework (like washing the dishes, vacuuming, cooking

) cuz that was according to her a proper "method " of seeing weather i have a female soul
Some 6mo ago i finally decided to find someone qualified for this kind of stuff. i found sexologist and she instantly knew what is this all about...
so my advice is not to waste time on those who are abviously not familiar with gender/sex issues
find yourself a good counselor or therapist and he/she will help you in explore your gender and remove doubts cuz it is evident you still might have some about your gender....
don't accept any foolish bounderies like 23 yo which is very stupid and unexpalinable
- good luck -