What is the history behind vampires? Are they even real or just folklore stuff?
A vampire is a being from folklore that subsists by feeding on the life essence  and they are believed to be a legend
Sounds interesting, is it true that vampires hate garlic or something?
hahaha i dont know but Vampiric entities have been recorded in most cultures; the term vampire
And is it too true vampires love sucking blood?
Vampire
A vampire is a being from folklore that subsists by feeding on the vital force (generally in the form of blood) of the living. In European folklore, vampires were undead beings that often visited loved ones and caused mischief or deaths in the neighborhoods they inhabited while they were alive. They wore shrouds and were often described as bloated and of ruddy or dark countenance, markedly different from today's gaunt, pale vampire which dates from the early 19th century.
Vampiric entities have been recorded in most cultures;
Estries, female vampires of Jewish folklore that were believed to prey on Hebrew citizens.
Medieval and early modern Europe.
The 12th-century English historians and chroniclers Walter Map and William of Newburgh recorded accounts of revenants, though records in English legends of vampiric beings after this date are scant. These tales are similar to the later folklore widely reported from Southeastern Europe and Transylvania in the 18th century, which were the basis of the vampire legend that later entered Germany and England, where they were subsequently embellished and popularised.