Welcome! All Natalias are welcome here

35 yo is not old to start. Actually it is never late to transition. Of course the changes can be less pronounced and get longer to take place, but they will happen!
Transition is possible and highly recommended if you have gender disphoria. It is a wonderful thing to become who you really are, to allow your body to change, to see the female getting out of the male body!
It is vital a physician to confirm the diagnostic and get you into hrt (it may take a while, depending of where you live).
And yes, coming out of the closet is one of the hardest parts. I did not come out yet and it is one of the steps that make me really nervous, but you can find tips here and all the support you need!