This black guy beat me up badly?

im 15 years old, 5'6 feet tall, and 200 pounds. he is 16 years old, and tall and skinny. well first off he was right in my face calling me bad names and telling he could kill me, so i just walked away then he grabbed my shirt and pulled me back, then he lifted my shirt and slapped my stomach and i leaned over, then he slapped my face, so i hooked him to the ground. he got up and i swung again but he ducked then tackled me to the ground and punched me about 5 times in the face then he kneed my side and i screamed then he put his elbow on my neck and was choking me and i thought i was going to die, but luckily someone pulled him off of me. i am very scared now. what should i do?