New players here

So me and my buddy just started playing...somehow his MMR got absolutely spiked thru the ceiling and now we are getting shoved into sweat lobbies. I have 5 hours on the game, and I'm fighting players that have prestiged several times now lol. Had a beetle (?) explode in my face? Have no idea how some of these bosses work, the assassin cockroaches crawl on you and just kill you? Hives can hit you thru walls? I'm just super confused and frustrated, I want to keep playing but honestly? I'm not having much fun. Is this normal? Is the population for the game so low it just shoves us into these wild ass matches?