My best friend lost her virginity and has been growing further apart from me, because I haven't, Help !?

We're both 15 and she lost hers a few months ago. She's being a total ***** tbh, and I don't know what to do. She's joined a new click, thing and it's awful. They all have lost it, and they tease me because I'm more serious about things like that :/ My other friend is supportive and understands because she's doing it to her aswell, but I feel so pressured, I don't know what to say back, when they start giving me hle and making snide comments... it's depressing really. Please help !