A prominent surgeon I spoke to talked of Blending. Ie being presented in a way that does not Jar with the eyes of others. Now it is up to the individual how they feel, some are fine to stand out and more power to them, as long as they are respecting others and prepared to deal with the reactions of others.
For yourself, As you are young, I can totally understand why passing is very important. As you have your whole life ahead of You. As long as people close to you accept you for you, I get why you would want strangers to not know about your journey.
For what its worth, many Ciswomen are insecure about appearance too. So don't let it get to you too much, just try to find a point of balance.
For me, being almost 40, to blend and be accepted in a TransFemale role is ideal. Anything else is unrealistic as even after proposed facial work, I will still look a bit manly, just in a very butch females athlete way rather than the current Pretty man with brow ridge way I do now. Thats ME . Im good with ME. ......
I have 4 kids and a wife, and I wish for my marriage to my Hetro Wife to work so there are limits on change to my role and physical appearance. All marriages require compromise
In terms of style, a very beautiful trans woman years ago said to me, find a style or two and work with it. ie for me, Sports wear, and leggings, and jeans work well. A night out would be Chelsea boots, tight dark jeans, and a androgynous shirt, with a little bit of make up to bring out my eyes, and cover the little bit of facial hair the laser hasn't yet got rid of.
Day to day, I tend to not wear any make up bar a little concealer for shadow.
Dressing in things that don't suit your shape or age will get you noticed fast...thats my two cents. Ie if You are 50 and 6ft tall with a typical skeletal structure of a MTF Caucasian, dressing like a Female politician (think Teresa May) you Will blend. Dress like Pamela Anderson and you won't.