Worried about my future in nursing...planning on enrolling in a 2yr b.s. nursing program next year?

I've always loved anything in the medical profession (im 19 now) but now, i have extreme anxiety when it comes to many things. im working at a medical lab and i cant even bring myself to draw blood from a patient using a erfly iv. i get overcome with extreme anxiety. im just too nervous/scared to do anything. even when all the other lab techs were practicing drawing blood on each other (and making a lot of mistakes in the process, after all, we were all there to learn) i would just freeze, even though i've drawn blood about 3 times already. ive recently become a very nervous person and lay awake at night thinking that i desperately need to change majors. even the idea of a sponge bath worries me. my other nursing friends are eager to learn and practice even though they have no more experience than I do, and i just stay scared in the background. i know it seems that i should drop nursing asap from what i've said but i think its just a case of nerves. did anyone feel this way?