I am a salary employee. It is set that I work 45 hours per week. My wage is figured on 8 hours of work with an hour paid break per day. I am an evening supervisor at a conveinence store in North Dakota. Am I entitled to some type of overtime pay for working more that 45 hours? For example by the end of this week I will have more than 65 hours in.

No salary means you are willing to accept your pay at that amount no matter how many hours they have you work.
If they only have you work 15 hours they still have to pay you that set amount.