I am 21 non smoker, and i've had chest pain for 2 weeks now. history of anxiety..if this was heart attack symptoms would i have known by now ?

Yes, good thinking!: This is the sort of thinking you need to do to help diffuse health anxiety. Nice start! Also - you have none of the risk factors and do have the Hx. You'd be a pretty good dective! That's what helps. If you want to get even more skills - start a few sessions w/ a CBT therapist. You'd probably be an A+ learner.

Probably not cardiac: That said any pain in the chest or abdomen lasting greater than one hr. and recurring needs medical workup. Write it off to psychological only after the physiologic is excluded