Honestly I've never seen an aggressive common boa. Your's is still rather small if still 2 feet so I hope your prepared for a much larger animal in the coming years.
My first impression is that your snake is stressed out. Buy a boa keeping book and make sure your enclosure, care, and feeding regiment is ideal. (I could go into this but don't feel like writing out a care sheet when the research on such a common species is so easy)
Make sure to keep your snake secluded. A high traffic area is not good for his cage. A mesh or glass aquarium is too open so cover most of the sides. Leave enough space open so your snake can get used to you being in the same room without feeling as if it is out in the open.
Don't handle your snake until it's feeding nicely and signs of stress are minimal. Feeding prekilled rodents is safer, but may also reduce aggression in snakes.
Using a snake hook (properly) to remove your snake from it's enclosure may reduce the feeling of encroachment/cornering. Of course begin slowly and not more than once daily until you and your snake are comfortable.
Good luck.

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