Hey, not your fault! So many people were lied to about that.
My first family betta was named Penny. He was a blue VT male who lived in a one gallon vase with plant for 4 years. We did weekly water changes and used bottled water for him. After he died, we all got our own bettas. I picked out what was either a boy or girl (can't really remember!) red betta. Lived in a 1 gallon bowl for maybe a year? Then I got the blue penny, and then Silky. Silky was my last betta before I really got interested about a year ago! :) I was nine when I got him, and silky lived for 2 years in a 1 gallon tank with an airstone. He was a white/pink/blue VT male, but the whole time I thought he was a girl! HAHA. Poor boy!