Return of Reckoning

Hey kind people, can someone explain to me pls why is my XP moving too slow? As 20lvl shaman, I have done about 12 PQ in a row, with 40lvl chosen, my friend.PQs and lot of bestiary and I gained the only 10xp. How is that possible?
Thanks

You can't power level. If you want to get XP, play Scenarios, quest / PQ in a group around your level, or run oRVR.

Thanks, I figure out we shouldn't play in a group, there's a big level gap between us. He took all XP. We didn't know that.
Thanks a lot