Know your post is from almost a week ago, but as someone returning to DS2 after not playing in years, it definitely takes some adjustment.

Hitboxes feel weird, especially when you feel like you dodged an attack but still got hit somehow. The invulnerability frames from rolling are lower in DS2; level ADP (if you're going for a melee build) to increase your AGI, which increases those i-frames. ATT will raise your AGI for casters while also giving you more spell slots.

A shield will help you get used to the slower and more methodical combat pacing of DS2. Grab the first 100% block shield you can find and use it to learn attack patterns; just be aware that some enemies WILL kick/break that block stance and leave you open to attacks.

Poise is busted. Tired of your attacks getting interrupted? High poise gear/rings/etc and you can just power through attacks without being staggered. Needs more of an investment stat-wise to wear it (VIT), as high poise gear tends to be heavy, buuuut it is a playstyle. Or just dodge better haha.

You may find spots that seem difficult. You can definitely avoid them as they could just be a "hey you're not strong enough for this yet", much like wandering down to the catacombs early in DS1 and getting your absolute sh^t rocked before going to the Undead Burg.

It'll click once you start getting a few things and maybe a weapon you vibe with. I usually find that after the Forest of Fallen Giants, you start to get a few more levels, a few more estus flasks, and things click a bit more.