Hi.
I know how you feel I'm 5ft 4 was 15st8lbs in April now 11st4ish, started running in may, first marathon 3.5 weeks away.
My advice is get running and eat sensibly. You cannot loose weight just running need to keep the diet going I average around 1200 calories a day some days I go Upto 15/1600 calories do when I do a long training run I'm actually -300 or do calories for a day.
You just need to be patient and determined. .
Start small and don't be Embarrassed, son't go to far to fast to soon it's macho bulkshit that screws you in the short term.
Slow n steady, build your distance up and don't really worry about pace, with time and practise you will naturally speed up when you have some experience.
Remember humans are waterproof.... So if it rains who cares don't give up for things like rain, get a program there are thousands out there, great plans on here, also asics.co.uk and loads of other places... Just jog and with time it becomes faster then one day you relies you sren't embarrassed and that other jogger that was 50m behind you is still 50m behind you ;/)
Don't over complicate it slow, steady, increase on average no more than about 10% per week and enjoy yourself.
Edited: 18/09/2012 at 22:34