You could have a look here :
https://www.susans.org/forums/index.php/topic,190486.msg1696988.html#msg1696988and here:
https://www.susans.org/forums/index.php/topic,190486.msg1697083.html#msg1697083Use only what you feel applies to you... take your time...
the usual process is to talk to a good gender therapist, who can support and guide through the steps.
It might be possible at home to say you need some counseling, and look for someone who has, amongst others, gender on their list.
Or it might be possible to ask a school counselor you trust for a referral, or ask at plannedparenthood or a lgbt center.
And there are findings that being tg has biological connections.
So its neither your nor their fault.
And its not a matter of religion. If people would be born with a visible birth condition others were also called to help.
Some people additionally use the explanation of a twin... they will be like their male/female twin, with the same sense of humour...
They might have some restraints what the neighbours think, for example... but there are more and more tg people, and people get used to it slowly...
I'd say take the time you need but keep at it...
watch out for your safety...
and remember many others have done this and have eventually been successfull, too

have a *hug*