Happy birthday!!! (belatedly)
A birthday doesn't count, so dno't feel bad about it. And those size 10 jeans will fit before you even realize it. I remember the day I found some size 38 jeans (equivalent to... 8 american size I think) and they fit... omg, I just bought them because they fit (the colour is sort of meh... grey, I don't like grey clothes but it is a size 8!!!!). Such a great feeling, you know what they say: happiness is fitting into your skinny jeans
Have a great week, Camy