4 stone to loose and struggeling to say motivated :(

Hello,
My name is Bethan. I have 2 children (ages 5 1/2 and 1 1/2). Since having my children I have struggling to keep the weight off.
Before having my first child I was 8st 12lbs., after having my first child I dieted and got down to 9st 2lbs.
I am nearly 2 years on from having my second child and I am really, REALLY struggling to find the motivation.
My current weight it 13 stone and I would like to be around the 9 stone mark (ideally 8st 12lbs). So a HUGE 4 stone to loose!!! :(
If anyone can give me advice, a friendly message here and there I would be so grateful.