hang in their bro.. im 17 i went through the same shit last year I used to hang out with older guys drink alot and did alot of things im not proud of.. things that have fucked with my head...some of the worse things im not going to discuss here... I remember one time I ran away from home went out drinking with a friend of mine and some older guy... story turns out I almost jumped off a bridge that night... thats one of the lesser things i did.. dont worry though things will look up for you, I had the same thoughts i wouldnt amount to anything.. but it got better I apoligised stopped drinking and tried my best to straighten myself out.. but as far as people say you should stop smoking bud.. i think maybe give it a little break but dont quit mate.. i know it helped me alot .. my advise to you is ditch these older guys theyll cause nothing but problems for you.. think about it they arent worth your future... sorry im kind of venting here too!! anyways mate have a good one!