I have a story that goes with a question.

So I had this teacher last year. She taught my Honors ELA class. She is a great teacher. She still teaches at my school so I thought I would stop in and say hi. I know that was normal. But I started writing her letters like twice-three times a week. I tell her sometimes about my life at home. She tell me stuff about her too. I was just wondering if it was okay to tell her things about me without it being inappropriate? Like would it be weird if I eventually told her I was bisexual? I fully trust her right now but my friends think I may be crossing a line.