New tires make a workld of difference.
Seriously, all flaming aside, you should not be wearing rear pads before the front. This tells me you are not fully using the front brakes properly, the front is where 90% of your stopping ability lies. It is very common for new riders to be intimidated to use the front brake aggressively.
Find a nice clean patch of road and practice full stops using only the front brake. Get more aggressive as you gain confidence. You should be able to get the rear end very light under full braking.
In a panic stop using the rear as your primary braking source, the rear wheel will lock and you will slide into your obstacle.
Good Luck, Ed