Is 12kg heavy weights?

I lifted it up and felt kinda proud. My brother and boyfriend say it's nothing, but my friend agrees with me that it's impressive. I mean I did it with one hand, and on one hand I could lift it to my chest 4 times, but on my weak hand only once, but I have never lifted weights and stuff like that, I just did it naturally.
Is that kinda strong or is it just "meh"?
Help me win my argument against my brother and boyfriend XD
Is 12kg heavy weights?
Post Opinion