hey frost,
you're probably a brilliant programmer and an excellent logician when it comes to designing computer programs which can implement your trading protocols
why?
no emotion involved, you're just doing the intellectual part of the process and so you can apply yourself step-by-step
apply the same line of reasoning and logic to your trading
why do you get out early?
fear of loss
why do you fear losing?
lack of equity
your basic problem (which you've stated previously) is that you are currently undercapitalized
when trading it is optimal to risk only 1%-3% of your trading capital per trade
... what's the saying, if wishes were something or other?
since we can't look at the optimal scenario, lets take a look at what is practical
if you can risk 5% of your capital base per trade you are looking at a pretty decent stop loss level on any of the e-mini instruments when scalping for $80 - $100 ($80 NQ, $100 ES and YM)
so
how much capital is required per contract for an approximately $100 stop loss level?
$2000 ($2000 x 5% = 100)
so for each $2000 of equity you have, trade 1 contract, with a fixed price target (if you have to get NinjaTrader or another software which will allow you to set your trading parameters, when you see the setup, take the trade and
back away from the terminal 
once your have your trade on, look to re-enter the markets when another trade scenario setsup
now you just need a good SCALPING METHODOLOGY
I'm betting as smart as your are, you can figure that one out for yourself
your problems are psycho-logical (this is true for 99% of all traders, the other 1% are psycho-paths)
this problem is remedied (not easily, but it is remedied) by having a system with a sound positive expectation, reasonable profit targets and most importantly of all
excellent money management
best,
Jimmy
