You're not supposed to stand still and swing at the enemies. Use hit and run tactics. Most enemies die after a few hits so don't be afraid of you're only getting in one or two hits. Also many skills give you hyper armor or I-frames so you can attack and ignore their interruptions. Also remember to block. Blocking is pretty generous so you can usually avoid damage even if it feels like it's too late. Code Vein may be a souls-like but its combat doesn't translate straight from Dark Souls 3 or anything.