I'm sorry you are having a hard time with this. You aren't alone! Mine are 2 yrs., and 3 yrs. old and both trained between 6-8 months of age. I am a stay at home mom, so I think it made the consistency easier. Our system was to take them out or on pee pad every hour, without fail. And if they didn't go, wait 10 mins. and out again. If they did good, they got a treat. We did this until they were about 18 mos. old. If I left the house, each would go in their crate.
Yes, it was very time consuming, but well worth it in the end. There were plenty of accidents when they were puppies, but I did notice a change after 6 mos of age and after neutering.
Don't give up - It IS possible to potty train a yorkie!