Please don't give up! I had stitches like that when I started-mine were from moving the fabric too fast. I was watching YouTube videos, and did not realize most of the videos were "sped up" and narrated....I thought I was supposed to put my petal to the metal! When I slowed WAY down, my stitches improved. And be sure that your quilt sandwich is never caught on a corner of your machine bed-that makes for tiny stitches in my experience. And, yes, when you first try to FMQ a "real" quilt, it feels much different than on a practice sample. Just be sure to puddle up the small area under your needle and relax and enjoy! You have gotten some great tips here....now go practice!
Edit
ne other thing that really helped me was quilting gloves. I purchased Machingers, wore them out, and now I use gardening gloves-anything that has some grip on the fingertips.