I think I may be a lesbian. Do I still need to worry about birth control?
No matter how you identify, you should use birth control if and when you have male partners. You’re right that birth control isn’t necessary when you’re with another girl. You can still get STIs, though.
Herpes and HPV are transmitted primarily through skin-to-skin contact and can affect everyone. There is a vaccination that can protect you against HPV, so talk to your health care provider if you haven’t had it already. It’s also possible to spread other STIs between girls. The best way to check if either you or your partner has an STI is to go to a clinic and get tested.