A lot to break down here so I'll try to make it simple for you since it looks like you're new to the whole Swamp Biome.

The Swamp Biome is the Defacto "make-or-break" for players. It's Hard. Even with 2-3 other people it's hard! The game scales difficulty based on skill and armor levels. (had a dev explain that to me). Since you're seeing two star creatures means you're skills are super high and you should be able to go into the swamp no problem.

The wraiths only spawn at night, so there's an easy out for you there. Go during the day. Takes time to travel to that biome you said? Make a base that's gonna be a few minutes sail to your island. That 20 minute trek seems to get you harder then the guys who kill you. I sure as hell understand.

Bring stuff on your boat to make a portal to that base you made to go into the swamp. Abominations are super easy since they're slow. Axes are good to take them down. Need a block skill of at least 20 with a bronze buckler to parry.

Lastly but not at all the least you can do to make this all easier for you. Ask for help instead of crying like a baby at how bad you are at the game. If you cry like this about like, I'm sorry for you. There are hundreds of groups that are willing to take their end-game gear with you to go for a corpse run. They'll defend you, build boats to sail there, and all that. Try asking for help before the next time you go on a temper tantrum.

Fact: Enemies don't get scaled unless you have high armor and skill values, and the number of bosses you've beaten (1-5).