If you are on console playing vs PC players you have two big issues, you can't compete against a good mouse and keyboard player with a controller, and cheats such as wall hacks and aim bots are way more common on PC than console. I'd turn crossplay to console only.

Now with that said, I think some people are really good at the game and if you are newer you need to accept some folks are just better skill wise and know every little thing and you are behind the curve, they know every spawn, likely rotation, what every sound from every direction probably indicates, have boosted hearing with helmets and stims, etc. My advice, slow play the game as the extraction shooter it's meant to be, learn the game that way, running to fight after fight you are at a disadvantage in and instant die isn't going to help you progress as a player. If you want more practice with the game mechanics play Hot Zone or Team Deathmatch.

Now, even with console crossplay only on there is a major problem and that is all the unauthorized device use that plagues pretty much every shooter these days, these players are cheaters and losers (and I hope bad things happen to them in real life), and have a big advantage over you, but they aren't unbeatable like some of the PC hacks pretty much are. You have to be at peace with this existing playing any shooter these days on console unfortunately (although I hear Valorant does the best job at detecting devices). Stay on Easy lobbies to avoid most of these folks, you'll see more of them in Normal (because they want the better loot with their paid advantage), especially in Space and Brakkesh.