I cant breath?

im a basketball player and I stoped a lil and i was playin ball and in 15sec of the game i feel like iam breathing threw a staw and i feel like some1s sittin on my chest and i can tast blood. Its been happening and i told my parents and they said dont worry about it but i think i should. Should i got 2 a doctor or maybe its a cold and it would go away or somthin ?