7 years is long time.
You wont get divorce easily as explained by above LD.
a) It will take a lot of time [5-6 years] and money to get divorce [contested divorce]
b) If she files any false cases [DV, 498a] a good 5-6 years is gone coming out of it clean.
So a + b = 12-14 years + money to lawyers, in all of these your children's life will be spoilt, suppose if you claim your children through Gaurdian & Ward act case... you wont get the children, the custody of children will be given to the mother as they are still small, you will get only visitation rights.
Instead of all this, think like this, you love your kids, and you want to be with them. Some things in life come with packages, like toothpaste ke saath dabba free, you could throw the toothpaste box and just continue using the toothpaste, but now that you have got children out of the wedlock, here you cannot treat your wife as a toothpaste box.
Try adjusting with your wife. If you cant fight them, join them !!