Is it also a problem when you train with one of the advanced people? If someone throws you so hard that you have trouble rolling out of it, you can tell them to take it easy. Especially new people sometimes don't realize how hard they are throwing, it's a favor you do them by saying something.
Your rolls will keep improving I'm sure, and one day you'll get to where it doesn't matter how you're thrown and you'll just be able to adjust to anything. But until you get there (and that takes years, not months) you need to communicate with your training partners and train in a safe way!