You can be bi but still lean towards the girl side more. If you still believe you have attraction to boys, then yeah, bi. If you don’t, lesbian!
You can also be bisexual but not attracted to both the main genders. While bi normally means you like the main genders, I actually think it means you like 2 genders. So if your feeling attraction to, lets say nonbinary people and girls, you could technically say bi.
If your pansexual, you like people by personalities and not gender. I think if you like girls more, your sexuality label probably isn’t pan. Unless you believe you might like trans people, nonbinary, intersex, etc.
If you need more help, you should be able to talk to someone about this, like a school counselor. If you don’t want to because your too scared, and this is going to sound weird, go to an online app and make a friend in the pride community. I swear, if you vent out your feelings to a stranger, that stranger can be seriously helpful. JUST BE COMPLETELY SURE THAT THIS PERSON IS ACTUALLY NOT HOMOPHOBIC. Also, most the time the people flashing the pride thing are older, which also can be helpful.
I hope this helps, sorry for the long response.