While it is true that the swamp is a difficulty spike compared to entering the black forest, it's mostly about knowledge and experience in my opinion. If you will ever play the game fully for a second time, I'm quite sure that you will revise your opinion. At least that's how it was for me. I died a lot in the swamp when I first entered it, now it is very manageable.

Never go at night, get the best gear and food possible, use healing and poison meads a lot, don't run constantly, keep some stamina to get out of tricky situations, learn to block with shields, avoid the water and choose your fights wisely. I'm sure you'll be fine soon.