<human>: Can you summarize the given text in a few sentences?

I (F24) got a message from the oldest out of my 3 little sisters (F13), and she asked me when I was younger if I ever questioned my sexual orientation. She said that she has been really confused by her feelings lately, but she is too scared to talk to anyone who might judge her about it. Now I am glad she came to me and I support her 100 percent in everything, but I need a little outside assistance on how to talk to her about this. My own personal experiences with middle school and sexual orientation have left me quite cynical, yet I don't want that to reflect in how I talk to her about it. I haven't even started the conversation, but she wants to come over my house tonight and talk about it.
<bot>: How do I (24F) talk to my little sister (13F) about her uncertainty of her sexual orientation?