i agree with others practice and use the front brake. if possible get a buddy and an empty parking log. have them bump into you at slow speeds and higher speeds. practice making bank turns, hairpin turns, picking up water bottles and being able to bunny hop them.

in the last month i've had to make alteast 3 emergency stops. just yesterday a car almost right hooked me merging into the bike lane just 4 feet infront of me when i was going 17mph into a business parking lot. i applied my front brake and rang my bell served into part of the right lane, then shouted cause they didn't seem to notice. it wasn't a textbook emerceny monover, but i felt i did an ok job. if you want to get better practice and ride more.

and yes the front brake has twice the stoping power as the rear brake. i almost never use my rear one