I'm going to assume from your post that you do have a system in place, and your problem, which is common, is that you feel the need for some extra action. You know, and I know, and everyone else with experience knows, that this is very destructive to successful trading.
It will help to open a simulated account somewhere. Keep it open on your desktop. When you feel the need to trade outside your system, do it there, and not with your capital. Keep an honest and regular log of this account. Mark every trade, in and out, times and dates. Treat it just as seriously as you would your system. You'll find that it will draw your attention away from your system, and let you screw around on your own time.
And who knows, you may find that you have some discretionary talent. But in any event, always keep the two accounts separated.
(Or, you may prefer to hear this advice put another way, in a well-worn phrase: "Don't shit where you eat.")