Well, once you do begin to transition, especially through your immediate appearance such as hair, clothing, or makeup, inferring that you are transgender should be a rather simple. This is especially conspicuous for trans-women overall, for two primary reasons:

1. Biological females already wear masculine clothing at times, whereas the antithesis of this scenario is more infrequent and generally considered less socially acceptable. So, before one undergoes hormone treatment for an extensive time, their presentation is the greatest clue into this phenomenon.

2. Estrogen usually takes substantially longer to alter one's appearance and voice than does testosterone. So, for future reference, at first your biological sex will be an easier deduction to make than would the case be for a trans-man.

Of these two cases, the former revolves largely around one's inference before the transition is complete, and the latter revolves around during and thereafter the transition. The best advice for you during this particular period of time would be in the former piece.