Hi and welcome,
Blood is linked to the concepts of life, vitality and physical warmth. When you see blood in your dreams it is thought to be a potent symbol of energy; all dreams are more about symbolism rather than the actual image itself, so that seeing blood in your dreams is not at all the same as seeing it in waking life. It’s all to do with what your subconscious thinks blood means to you; for most of is it means life, as mentioned above, the liquid that carried oxygen around our body. It may also represent a spiritual vehicle in some dreams. It’s quite rare to have colour in dreams, even though we often seem to remember some colours, and blood is probably the largest symbol of the colour red in the world, so there may be connections there. The colour red symbolizes the vitality of energies and passion; it also has maternal connections with the womb and any anxieties associated with it.
Maybe because you are drinking blood your subconscious is saying you need more vitality, more energy, more passion, more excitement, or more life experiences. You may be able to make more sense of this than I can based on what’s going on in your life at the moment; rest assured though, it doesn’t mean you have a secret passion for drinking blood.
P.S. Are you a big Fight Club fan, if you like watching action movies a lot it may also reflect a need for more action in your life?