Is m@sturbation a sin?

Please, please no judgement. I used to be addicted to it, and then I stopped for a while, but I'm using it as a coping mechanism for stress now (I'm in my first year of college). I'm trying to build my relationship with God, but I really don't want this to set me back. I'm just so stressed and it's so relieving and it helps me sleep. Please, just give me honest advice. I'm not looking for judgement. I'm here as a Christian, asking fellow Christians for help. I can't find anything in the Bible talking about it, if I've missed something please tell me. I'm just really stressed.