Is it normal for a 14 year old to feel SUICIDAL ?

Im 14 and depressed all the time I dont like to belive in depression I believe in mind over matter but i feel sad loney not loved worthless ! could it be puberty i think i hit it ended at 13 for me . But u never know right ? I dont have any friends and im a loner I got hurt today but slipping on our wet porch and landing my elbow on the wood and iron welcome matt ! I got a <> < shaped scare on my elbow rom the iron square patten on the matt , it was bleeding alot ! but the point was it felt good the pain ! I have had thoughts about ding and killing myself before and I wanted to cut myslelf after i got hurt ! Please help and thanks for reading .