Welcome to aikido and I'm glad that you are enjoying training. I agree with all of the posts here, especially with Brian Vickery.
Training with beginners is very beneficial for the more experienced and the beginner. At the dojos that I train at we have mixed classes. Beginners are not segregated.
I personny look forward to training with beginners becasue they are preconditioned to react in a certain way and you must provide clear intent and direction. Not to mention significant control to perform the techniques correctly and safely.
Beginners are most welcome.