I need to vent...

I'm a medical assistant  student and this week we are working on venipuncture in my class. It's been a very stressful week for me because I can't get the vein. My first 3 attempts I failed and on one I practiced on my instructor and I failed. I tried to do it on another 2 people yesterday and I failed again. Everyone in my class was watching me too and I was so embarrassed after. I feel like a complete failure. Everyone else has been successful except me 😢 I'm about to give up on this career. I've worked so hard and i haven't missed a day of school since I started. I've never felt so bad in my life.