How can you tell if you are a boy or a girl, or something else entirely?

Usually, if they don't introduce themselves, I don't make any assumptions at first. I just guide the conversation keeping both genders in mind, for either case. Once the ice is broken, they will start to open up and reveal more about their situation, and their relations, or they will start using specific pronouns.

My personal experience on how to tell if you are a boy or girl or something else is quite limited but I say go with what your heart says. If you associate more with being a boy go ahead and do you or if you're a girl go and get your stuff on c: If you are something else entirely I applaud you because you are unique and that's all anyone can ask from minus your happiness.

Follow your heart and experiment, cometimes gender can be a fluid thing. It is often confusing, don't rush to put a term on it

This is hard to put into words, but sometimes its very hard to 'know' what you are, boy, girl or something else. I personally truelly believe and support the 'something else entirely', as I do not subscribe to the gender binary for all people. Some people are 100% comfortable with their gender identity and/or expression. Some people are less sure, some people never decide and are ok with that as well. Not a 'something else', third gender or hybrid but instead choosing to remain fluid. There are alot of options here as I feel gender identity and/or expression can also be viewed on a dynamic spectrum. I also support the idea that for 'most' people gender identity 'settles down' a bit for people growing up through puberty and the young adult years. And like sexual orientation and attraction or lack thereof can change as the person matures. I just gave a complicated answer that could be paraphrased by the following: It depends on the person.

It's completely psychological. Whether you assosiate yourself with being female or male. You can be biologically one of the two genders, but you are what you think of yourself as.

You will know you gender whenever you feel like a man or a woman or.... hell be a toaster as long as you're with who you are nothing should stand in your way.

This is a difficult question to answer because it's hard to explain exactly how gender feels, because society generally accepts that there are masculine females and feminine males so you can't really base it off of being a "tomboy" or being "effeminate". For me personally, as something else entirely (genderqueer/agender) I just don't feel like a male body would feel right and neither will a female body so I'm just floating somewhere in the middle most of the time.

Try looking up the different genders and their definitions. It can be really hard to figure out, so don't get upset if you find one thing you identify as and then another.

In my opinion, gender is something made up by society. Judge what you identify yourself with by your own gut feelings. You know yourself better than anyone else.

It's how you lead your life and what feels right to you. It's who you want to be and how you want to be known.