Last night, i threw up my dinner, and then my chest hurt. am i too young for heart attack (30) ?

Yes too young: Yes, you are probably too young for a heart attack. Besides the pain of a heart attack is usually not after throwing up. It is a dull, pressure like pain like some heavy object is placed on your chest. You probably have muscle pain as a result of the vomiting.

Probably: I've seen under 30 have heart attack with type 1 diabetes, Cocaine use, and congenital heart condition (3 different people). It's very unlikely but if you have symptoms that worsen with exertion, you should seek medical attention.