I've been pretending to have an ebike and it's catching up to me

Like the title says. My friends all got ebikes but I just cant afford the few hundred dollars on a whim. I didn't want to be left out of our group rides so I rattlecanned an old trek black and taped some plastic to the frame that kind of looks like a battery pack.

I've been hitting the spin bike a lot more and making humming sounds when we go ride but I'm not sure how long I can keep this up. I almost got dropped last week after they unrestricted the speed controller, and they're planning a really hilly brevette for this weekend. I'm not sure what to do