Question regarding my activity level and calories needed

Hey everyone!  

When I go to college, I had free access to the pretty nice campus gym, so I would workout 4 days a week.  Usually over the summer I get a gym membership.  I have a busy job, however.  I work at Chipotle (its a mexican fast food type restaurant) and it is VERY busy.  I work 40 hours a week but my shift is usually 4 to midnight closing.

I was going to purchase my gym membership, but I was pretty hesitant to do it because I don't have much spare time outside of work, it costs a decent amount, and I actually am so exhausted after work I wonder how many calories I am actually burning.

I was just wondering if you think my job is exercise enough, or if I should increase it.  I don't know if I should even count it as exercise, but it sure as hell feels like I'm getting a workout.  My legs ache the next day.  I work 8 hour shifts and i get one half hour break.  The rest of the time I am serving customers in mass amounts quickly as possible, frantically making burritos.  And I usually close, so that involves scrubbing the tortilla and quesadilla press clean and cleaning out the food wells, doing dishes, etc.  

I am a 5 foot 9, 20 year old female weighing in at 135 pounds.  I was just wondering what others input is.  Am I fooling myself by telling myself I'm burning a significant amount of calories and that work is a workout, or am I not giving myself enough credit?  How many calories do you think I should eat, what do you think my activity level is?  Help!

Thank you for your time!

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