you do not have to be- its actually helping me pass.
pre t, i was around 180 lbs (82 kg), at 5'11". i held a lot of weight in my hips and thighs, with a small waist that gave me a very feminine/curvy figure. all id seen online were people complaining about the weight gain, how it made them look more curvy, and it scared me off of starting t for months
currently, 11 months on t, im around 200 lbs (~91 kg). i have gained weight. however, it is all going to my waist and stomach. my hips, thighs, and butt haven't gotten any smaller, but the extra width in my waist gives my body a more rectangular shape rather than an hourglass. i look more masculine and more proportionally balanced, it has done WONDERS for my body image and confidence.
obviously i cant speak to everyones experience, but as someone whod only seen negative things about weight gain on t i wish i wouldve come across a post like this before i started :)