How do I get off drugs m14?

I, a 14-year-old man, have tried many drugs, as I said in my other post, and was addicted to ecstasy for a while, which I've thankfully gotten over now. However, weed just won't let go of me, and I simply lack the strength to say no to myself. I keep finding new excuses and lying to myself. I notice how it's robbing me of all motivation in my everyday life, but I keep telling myself it's just weed and I just want to chill or something. Do you have any tips on how I can get away from it? Thanks in advance for the replies.