You know, someone had to buy all that stuff with hard earned money. It's okay to want to break things when you're mad, but it shouldn't be things that someone bought with his/her time and effort. Heck, I'm sure your parents bought those items for your use as well, and destroying them is a shame. Besides, your girlfriend is going to think you're an immature little kid if she hears about it.
Try running. I found that running an extra mile or two, even if I already ran in the morning, takes off a lot off your mind.
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