You seem like a very bright person, so I will be totally honest. You do not have to visualize yourself so much, but to be TS is mostly in your "self". It is not how tall or short you are, but in your being. It is not something you make yourself, but what you are inside. I know very tall pre and post ops, and it is more of a confidence issue. Hold your head up and keep your shoulders back. It is the main thing people will notice ( your posture). Holding your head down with shoulders hunched forward makes one look timid, and not compelling visually. I know you have probably done this, but ask yourself what is it that makes you TS.? Then post it. Most other TS will not judge you, but give you constructive advice, if you are willing to listen. I used to be a bodybuilder..weighed 210lbs and had a low body fat, but I trained very hard, which in your case will help you very much, as you are younger than I, but it will not be until you have taken estrogen for awhile before you will see secondary female traits. It would be nice to hear what your weight is in proportion to your height, as you dont want to be too thin, but working out before you start hormones will dramatically help later. I know of pre ops that think that just taking hormones will help them get secondary female traits without working out and just are lazy, then they wonder why they are not getting the sexy curves or the changes they are seeking. I do know genetics play a role, but staying healthy and keeping in top form is what it takes if you are going to want to look really good later. I wish you all the best.