I'm so confused😕

So I'm 16 and bi. I haven't told anyone, I'm a little nervous to but I don't expect any horrible reactions. Two of my cousins came out as gay and my family was cool with it. Just now, my mom gave me chocolate and I was like "thanks" and she said, "you're welcome, I got it to make your day" but she turned as she spoke and I heard "I got it to make you gay" I told her what I heard and she told me what she really said and we both laughed before she said "yeah, it's a good thing it won't, that would be unfortunate. Best keep away from it if it does". I'm so confused, I always thought mom would be supportive, but her comment confused me. Should I tell her I'm bi? Should I wait to see if I end up with a guy and not tell her I'm bi? If I get a girlfriend, do I not tell? I'm so confused right now. This helped, I needed to vent. Thanks for reading this far❤️ hope you are all well