Dude, your on track for now to stop stroking your dick for awhile...Give your man a rest for a couple weeks or so. Then instead of starting off with just jerkin it to try and get hard, try something else. Do this when you know you'll be alone and not worried about someone catching you so your relaxed. Find some pics of whatever turns you on, get naked and just look at the pics...Don't touch your dick...Let it do what it wants to do. You can touch any other part of your body, roll your balls around, pinch your nipples, rub your stomach, whatever, just don't touch your dick. See if it will rise to the occasion on it's own. If it does, don't force yourself to cum real fast...Enjoy a nice slow stroke and enjoy your body. If this doesn't work, if you can talk to dad or older brother and let them know you think this is a serious subject for you. Or hopefully a mature older male close to you if dad or bro aren't around.