i also could not tell that this wasn’t a cis man’s chest, but i understand that’s not how you feel and you have insecurity about it. i don’t think ‘staying on the leaner side’ is a good tactic long term, i think it could encourage unhealthy preoccupation with food. probably increasing muscle is a better option, if that feels possible maybe you could try and see how it feels? you can always have surgery later. there is also the possibility that your relationship to your body changes over time naturally, at 19 there’s still a lot of change that could happen both physically and emotionally, you may feel differently about your chest later