Yesterday, I finally made it to the vampire's home castle. I was unsure of weither to be a campire, or to become a werewolf. so before i was asked to choose if I wanted to be a vampire or not, I saved my game. When i found that the vampire lords have magic based attacks, I reloaded my save, and declined the offer. When I exited their castle, I went back to Fort Dawnguard. When i got there, I got a message saying "Your vampire blood begins to boil in the sun". After seeing this, i went into my spell inventory, and found that I still had a few vampire abilities: Life Drain, Reanimation of enemies, and Night vision.
I don't have the vampire lord skill tree, or the transformation spell. I want to become a werewolf, since it suits my playstyle of physical attacks. Will i be able to become a werewolf even though iI have vampire powers? Is there a way to reverse this (without reloading a much older save if possible), or is this normal?

Yes you can. Just go to Aela and she will give you the lycanthropy. Also, the vampirism you just explained, i think you may have contracted the disease from previously fighting a vampire. If you dont cure it before it is permanent, then you will become a vampire. It is totally normal. The only way you can become a vampire lord is if you are bitten by Harkon or Serana.

How do I cure it? I've taken cure potions, but nothing works. I also havn't been in any fights with vampires, So i don't know how i contracted vampirism. How can I cure it, or atleast get rid of the sunlight debuff?