Is normal to feel like you did bad. Is normal to feel like you answered wrong every single question. I feel like that now one week after doing step 2CK.
My solace is that I felt like that after Step 1 and in the end the result made me happy.
So, just so you know, you are not alone.
The single study source that helped the best for the exam: UWorld
First study MTB 2 / 3, maybe KLN, FA, Step 2 secrets, etc.
Then UWorld set at timed, unused and random, both for studying and for training stamina.
Remember the exam is hard and most questions depict vague but common scenarios to solve in about 1 minute, so your instincts too will be put to the test.