I completely understand how you feel.... like a hamster on an exercise wheel - working your butt of and getting nowhere. Direct sales can be tough. You did say that you love what your are doing. That is the most important part. If that is really true, things will begin to happen. It may just take more time. How long have you been with your business?
"I will persist until I succeed." – Og Mandino
"Don't judge each day by the harvest you reap, but by the seeds you plant." - Robert Louis Stevenson
"It's always too soon to quit." - I don't remember where I got that one.
Somebody said these things for a reason. Write them down and keep them handy for when you feel this way.
Hang in there!!