Actually, if someone were to ask me to suggest a career or field of study where you can use math and science but still have a life, I think engineering would be high on the list.
Like everything, it also depends on where specifically you work and your own approach to the work/social life balance, pace of career advancement or salary increases, etc., but I think engineering has a lot of opportunities where you can do both and do both well.
I've met many engineers, and they all seem pretty social and normal (keep in mind that I'm a scientist type too, so my perception of normal might be skewed a bit), and of course I might only meet the social ones...selection bias.