Your math is fine - it’s right on point for 12th grade - but maybe not for the other higher level schools. You’ve done as you should.
And very few kids get a 1590. And I can’t imagine you know any or more than one.
If Wheaton is $12,000 - and your parents can afford to make that payment each year, then it’s affordable.
You noted you got merit - but let’s say it brought it to $30K and they can only afford $20K, then it wouldn’t be affordable and you’d need to find others. You just mentioned merit but not affordability - but it sounds like it is.
So sounds like Wheaton is a home run!! Congrats - and if that’s where you end up, it’s great and best of luck.