OP, 150 is low, unless you do peds, and in 7+ years, the salary will most likely grow--salaries, when corrected for inflation, may not increase, but physician salaries will probably continue to grow due to inflation, although the rate is difficult to determine
you will not pay 10-30 in malpractice, your practice will
retirement is pre-tax (the max you can contribute is 16k, so if you made 150, and you contributed the max of 16k, only 134k of you income is taxable), and many practices and hospitals match retirement to an extent, and if you work for a university or the government, you'll be elidgible for a pension
loan repayments will be a lot
living expenses are really up to you: do you need a McMansion and a new car, or can you own an inexpensive house and drive a used car
So, yes, you have a lot, but you just need to realize that any money you borrow has to be repaid. Loan repayment programs do exist, but that's another can of worms. There's also the military, but 95% of all people in the military forum will discourage you for pursuing that route.
On the plus side, OK has two public med schools, so if you are competitive you should be able to get into both (OU and OSU), and if you aren't that competitive, OSU will still allow you to be a physician while keeping your debt low