There are several things that can help. I found using a low loft batting. (such as warm and natural or warm and white or something along those lines) really made a difference for me. Make sure your quilt is supported all around and if you have an extended table for your machine or have it inset in a table so the table is flush with the sewing surface it helps a lot. Trying to FMQ on a small free arm area is awful! One of the mistakes I made all the time (still do once in a while) is moving quite a bit faster on the curves. Kind of a swoop factor. That causes problems.
I also recommend Leah Day's tutorials and her craftsy class. Also Ann Peterson and Angela Waters craftsy classes on quilting. Craftsy has sales periodically and you may be able to get the classes very cheaply.
Beyond that, relax, and you will get better and better as you practice and work on the skill.