I had sex Friday night and it was very rough and long, on Saturday or Sunday I happened to look at my vagina in a mirror and it looks ripped and rite where the rip is I have a little white patch which looks like a blister

Could be from rough sex, were you not using enough lube ?

Or it can of course be a STD of various types and names. No way to tell over the internet, you will need to have your doctor check it out with an exam.