Hello Mary, and thanks for posting your comment.
You can't take away how you feel and nobody can change how you think about your sexuality, and whether you tell your parents or decide what you want to do, is up to you, being bisexual is an important part of who you are.
If you believe you're bi then you could please your parents, remember everyone has someone they always want to ring, a close friend they want to bring home, and if you decide to open up then make sure you have a plan in place if your parents become angry, perhaps you could tell one parent before the other.
If you are unsure how your parents will react, it can be a worry, but there are places where you can get help, and I'll leave that to people who know better than myself.
There's nothing wrong in how you feel and now you're an adult you can do whatever you want to and please remember there are people who are scared of telling their parents they are going out with someone of the opposite sex.
That happened to me and didn't tell anybody I was dating my first girlfriend for certain reasons, she became my wife for 26 years.
You are a person and instead of arguing or fighting with them, accept their response, they should settle down and just be yourself.
Enjoy the love you find.