Low cost homeworkouts?

Hehe, I know its stupid, but I must strive to appeal to SOME girls in my school (especially one) and a lot of people have been telling me to get buff and go to the weight room, which I dont want to do because I’m going to look like an idiot (I’ve never been in there, dont know what I would do in there)

So, I have at home, a 7 pound dumbell and a pullup bar, and a floor.

What can I do that wont stunt my growth? :cowboy: