Phobia of things running through my veins

I have a phobia of things running through my veins. Thinking about blood running through my veins utterly creeps me out. I've been debating whether or not I could get myself to donate blood, lately. I don't have a huge issue with getting my blood drawn, but I'm the height and weight of someone eligible to do a double donation and thinking about them putting my blood back into my body, terrifies me. Cold blood pulsing through my veins? No thank you. Ugh.