Why don't you give Slimming World a try. If you love Pasta you will be able to eat as much as you like. The SW diet really works, I lost 3 stone and am now a target member and managing to keep it off quite easily. Lots of special offers available for January. Good luck.
You can substitute cream for half fat creme fraiche. You can buy low fat pesto. There are lots of pasta recipes you can make using substituted low fat alternatives (as long as you don`t have a huge portion of pasta in the first place of course)!