Just pop in and buy a chocolate bar or an apple or just aim to park the car, then go home. Next time park and get out of the car and go home. Then park, get out and walk to the door and go home. Then one step inside. Then 2 steps, then build it up. Doesn't matter if it takes all week, one step at a time and make things your choice - not leaving because you couldn't cope, but because you are choosing to go home...