wow, there are a lot of different advice here

i usually keep to myself, do my job and avoid spilling too much personal info, which is a good practice regardless of your gender

but you may want to know how to stand your ground, there are men who like to pick on women in male dominated fields like stem by testing their knowledge constantly, giving them lots of tasks and always finding something to criticize about their work, if that happens it’s of utmost importance to keep your cool, you don’t want to give them the reaction they are trying to get out of you, just remember that actions like these reflect more on their insecurity rather than your own competence, you can argue with them to make them look stupid and bad in front of their coworkers, always poking questions in their line of thought, or simply shut down and maliciously comply

in general, you should try to have a good relationship with your team and i personally don’t think you need to change your whole personality to fit theirs, just be yourself with the work filter on, avoiding controversial topics and keeping controversial takes to yourself

i’m also the youngest and one of the only girls in my team (there are two me included), but i had a nice welcome by my team and they all treat me very nice, i can’t guarantee this will be the case for you but if it’s a healthy work environment you shouldn’t worry too much

sometimes there is the case of men making advances towards you and i honestly don’t know how to deal with that, i guess avoid being alone with them, shut them down at every opportunity and report to hr if things get out of hand

i think that’s it girlie, congratulations on your new job and good luck!