When will my brother grow the **** up?

Im 17 hes 14 he thinks hes so hard and **** its redicules i ******* hate his little ***, he does weed nonstop he thinks hes so cool when hes not, he thinks he can just do whatever he wants, we fight allot and yesturday he accually punched me and i beat the **** out of him. WHEN WILL HIS LITTLE STUPID *** GROW UP??? he acts like hes invincible and no one can touch him. My mom is never around shes always working. and our dad never been around. He blares this gay *** techno ******* **** i always gotta tell his *** to turn it down and then he just laughs. I sware soon im going to lose it walk in his room and shoot him in the ******* head. Its Pathetic he doesnt even know anything but he acts like he does its just so retarded he thinks hes all that and ****. What the **** should i do? my moms not in the picture so its mainly just me and him he causes her so many problems he got arrested like a dumb *** 4 times what can i do to make him more afraid of me and not pull **** behind my back? cause im going to ******* slit his throat soon.