brainlessone,
First, I think you need to have confidence in whatever method you use to determine your buy/sell/s-l points. Without confidence in your method or strategy, you will constantly be second-guessing your decisions, letting fear and greed pull you one way and another as your trade progresses, leading to lost profits on early sells and bagholder positions on too long holds. This sounds like what is happening to you now.
Everyone reads the charts differently. I use candles and classic chart patterns (a la Bulkowski). I do not choose targets or s/l points according to trends or boxes, I choose them by identifying likely support/resistance points (trendlines, past hi's or lo's or congestion areas) and volume, and set projected targets based upon b/o's from particular formations or directional changes within the formation itself. Momo in a stock dictates the duration of the move, not the target or direction.
In setting up targets and s/l's that I will not look at again, I tend to be conservative and set them halfway to where IMO they could potentially go (I can always buy them back on a dip if I feel the move will continue). I keep an eye on the futs, tick, trin and overall market action during the day. I usually scale in and out of most longer-term positions, so even if I sell too soon on one lot, or get stopped out, if the chart still looks good, I can reset the trade at another point on remaining lots, or buy again.
Anyway, this method works well for me. If yours is not working for you, perhaps you need to look at making some changes, and find something that is more profitable for you? Good luck to you.
Newly
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