Ive become vampire and now everyone keeps attacking me apart from the gaurds..

Well to become normal you either go on a cure for vampirism quest or become a werewolf from the Companions guild in Whiterun.

Also if you feed pretty much once a day (Game time) then it should hide your vampirism and no one will attack you.

Also theres 4 stages of vamprism. After each stage you grow in power and your weaknesses get worse.

•Stage 1

Vampires have a 25% increase to their Illusion spells. They are 25% harder for NPCs to detect, have 100% resistance to diseases or poisons, and are 25% resistant to ice.

Vampires are 25% weaker to fire, and their health, magic, and stamina stats are reduced by 15 points in the sunlight. Those three stats also do not regenerate.

Vampires have the power to reanimate the dead to serve them. They can also improve their night vision with another power.

Vampires gain a spell that allows them to drain the health of their enemies.

Stage 2

Vampires are 50% resistant to frost, and their
Vampiric servant and drain powers are more powerful.

Vampires are 50% weaker to fire, and their health, magic, and stamina stats are reduced by 30 points in the sunlight.

Vampires gain the "Vampiric Seduction" power, which calms enemies (animals and people) for 30 seconds. Thus, they will not attack you.

Stage 3

Vampires are 75% resistance to ice, and their powers of reanimating the dead and draining the living become more powerful.

Vampires are 75% weaker to fire, and their health, magic, and stamina stats are reduced by 45 points in the sunlight.

Stage 4

Vampires are 100% resistant to ice, and their vampiric servant and drain powers are more powerful.

Vampires are 100% weak to fire, and their health, magic, and stamina stats are reduced by 60 points in the sunlight.

All NPCs are hostile towards Stage 4 vampires.
Vampires gain the "Embrace Of Shadows" power, which turns your character invisible for three minutes.

If you don't want to be a vampire after you've been bitten, you have 3 game days (72 game hours) to cure it by accepting a blessing from a shrine or using a cure disease potion. If you've gone through some stages you can become a werewolf or take a quest to cure yourself.

•Curing vampirism
You can cure vampirism by turning to werewolf or by doing the "Rising At Dawn" quest.

•Becoming a werewolf (lycanthropy)
There are several benefits to becoming a werewolf. In human form, you have increased health. In werewolf form, your speed and physical strength are increased. You are able to travel faster, have claws to tear enemies apart, and can use your howl to scare enemies to run away from battle. When you get injured, you can feed on ravaged corpses as a werewolf to heal your wounds. The werewolf effect is only temporary, and you ultimately revert back to human form, but you can prolong this effect. As a werewolf, you can also avoid the rested buff from sleeping. To become a werewolf, follow the questline of The Companions Of Whiterun. Once you reach the "Silver Hand" quest, you will take part in a secret ritual, where you drink another werewolf's blood and turn into a werewolf yourself. You will be given a choice to commit yourself, and the quest will not advance if you do not commit.