Now I am not sure what exactly is the problem, but if you aren't a good blocker you should probably address that first. I highly recommend following the steps below. As with anything that relies on building muscle memory, practicing very focused and very slow is key to getting it right and will in the end teach you blocking much faster than just jumping into full speed multiplayer combat. Many players develop very bad habits to supplant blocking skills and never get good. Spend some time with this and you will be able to have a much better time ingame.
If you want to learn blocking properly and quickly I recommend starting up Native and clicking the tutorial. There are bots in there of various ranks, they have varying wpf levels. Start with the novice one, and put combat speed to slowest in the options. Focus on blocking only until you can block atleast 9 out of 10. Then go to the next bot who is called regularI think, do the same again. Work your way through the bots from low to high and if you are confident on blocking them all, you turn the game speed up one notch. Start while standing still, if you get somewhat comfortable doing it stationary, start moving around while blocking as you need to be able to do both at the same time.
If you can block the highest rank bot confidently on normal game speed, then you should have servicable blocking good enough for multiplayer cRPG. Although you also might want to practice blocking and then attacking back. You can also try blocking them on the faster and even fastest settings to get really comfortable with blocking, but don't forget that blocking players with wiggles, feints and holds is gonna take practice even if you can block normal attacks at the speed of light. Try to block with as small mouse movements as possible and hold down your blocks, don't just click them. With this procedure you can most likely develop the required muscle memory for blocking in like 1-5 hours. Took me a 1000 hours of just playing before I could properly block back in the day.