Sometimes I feel the same way, so I know how you feel. My question is, will any good come from telling them? If it will only break their hearts, than do they have to know? Its kind of like that saying: if you don’t have anything nice to say, don’t say it. The words dont translate perfectly but I think you get what I mean.
If your parents know your bi, than there’s no real point to telling them your a lesbian. It’ll only be making them upset. I’m not saying you have to marry a boy, but just let them think there’s a possibility to you marrying a boy. Sure you’re giving them a false sense of hope but the alternative is crushing their dreams.
If this in anyway sounds like I’m homophobic or against coming out with your sexuality, please now I’m apart of the LGBTQ+ community and I recently came out to my father. I’m just asking if there’s any point to disappointing your parents. Its just like telling a white lie, at the end of the day you aren’t hurting anyone by not telling your parents.
If at some point you’re in a committed relationship with a woman you can see yourself marrying, then maybe it’s time to tell your parents. You never know, maybe someday you’ll find a guy that you want to be with. Things change.
This is just my personal advice, please don’t take this in a negative way, I mean no harm. I hope this helped or offered some good advice