Answer:
The Internet.
Who you are.
Step-by-step explanation:
The internet is a big source to find communities and support in comming out, because it's a huge network that connects people, social media is an example of it. On the other hand, family, friends and a library are not good sources to find support in this situation, maybe the family could, but in most cases they are not supportive when someone wants to come out.
The sexual orientation refers to who you feel attracted, if you like boys or girls. However, gender identity is about who you are, it tells you if your are a boy or girl. Nowadays, gender identity is such a problematic topic, because there are people that claims to feel not a girl or boy, even-though their biology tells them what they actually are. If you have a male genital, your a boy, your gender is male, your biology tells that.
Therefore, the correct answers are The Internet and Who you are.