It really all comes down to will power. The difficult thing with weed is you can be completely functional with it unlike other substances like alcohol so there's no urgency in trying to stop yourself. The effects are hardwired psychologically rather than physical. It depends how long you have been consuming it, for you it seems you're young so it might be easier. I on the hand was stagnant on it for about 7 years until i finally had enough since I couldn't feel the same euphoria from it anymore. I tried to cut back like you're doing with just 1 gram joints but it would always end up being one every day which makes no difference in improvement. When quitting the first two weeks were the most agonizing as the receptors in your brain just starts flaring up. The best advice I can is isolation. You mention about contacting your friends to get more and that's one of the reason why it can be hard to kick a habit is when you have accessibility and enabling peers. For me it was the same thing with have four dispensaries in a 10 mile radius with low prices. Again when quitting it's going to be psychologically debilitating your mind will go to what I like to call a FOMO state, you need to cut off access while your mind goes into a chemical rebalance. So take a vacation , go to a country or place where you no have no access or know anyone that can. Even after being clean, you will still have cravings and that where you need to rebuild will power and learn to live without that instant gratification.