You'll certainly understand more about yourself as a trader if you learn to take losses....And if you can survive losses early on in your trading endeavors it should to help develop strict trading techniques to allow you to prosper in the future.... Personally I believe some early 'nasty' losses are better for you in the long run, rather than early profits...
Taking a loss doesn't always mean it's a poor trade if you follow your strict money management techniques.....In fact it's a good trade - on the exit anyway... The entrance point is the real question rather than the exit....
Also there is no such thing as 'what if' or 'could have' in trading markets...
Remember you trade the market rather than make it - so if that market goes against you, you need to trade to that situation with money management techniques...
Personally I would rather have a flat or losing trade following my rules, than just hit it lucky for a profit on a trade where I've entered wrongly....
I guesss being a full time day trader since the mid '90's means I have no emotion in relation to profits or losses - it's just my execution of a trade in relation to the market that is of importance to me.... The rest just follows....
