How to come out as transgender to my parents?

I'm a transgender male, and have known I was for a while but I have only accepted myself recently. I'm thirteen and a half, and I feel like I have to come out as quickly as possible to my parents for a better transition. I have already come out to them as being attracted to females, and they were okay with that. Also, they may have an idea already that my gender identity isn't cis. Please help me, I can really cope with the dysmorphia I've been having lately, yet I'm terrified of coming out for multiple reasons. Also, I go to see my therapist regularly for other reasons, maybe she might be able to help? But how do I tell people? Please help. Thank you