First and foremost, listen to what Burnt Toast has to say. That will give you the true insight to how THC works with your body. My own personal two cents though is that you will be clean within 7-9 days. Back when i was your age, i weighed around 145 and also had a high metabolism. I actually smoked almost the same amount you did, for about 4 days, and had a urine test the following week and I ended up passing fine. I'd thought i would inform you of this maybe to calm your nerves a bit if you do have a test comming up. Don't stress thinking the THC will be in your fat cells for 30 days when you weight one hundred and twenty some pounds and have a fast metabolism.