Why do my muscles hurt after working out?

so i did calf raises...60 of them with 40 pounds on my shoulder and i don't ever do them really. I worked my calfs on sunday. it's friday and they still hurt. did i tear a muscle or did i just work them really good and so since i don't work them out much..they are sore.

its been 5 days if sore calf muscless :(