Ok where do I start, lots to say here
First of all, I'm sorry you had a bad day, I really am. I've been there and it feels like someone beat on your self esteem so hard you can barely look yourself in the mirror.
However, I'll tell you this....
No profitable trader gets there without a fair amount of losses.
You must learn from your losses to get there. Losses teach us some great lessons.
Those that learn from losses might prevail in the end, on the other hand the majority runs away and comes back without the lesson learned.
In order to win in this game you must learn to lose, and lose you will.
Now....
Something important. We are all competitors here, therefore don't expect to find the holy grail by browsing the forum. Experienced traders great days are based on the unfortunate newbie traders who think this is some type of Nintendo video game that you can master in 2 weeks.
As far as averaging down, if used correctly, it can be a very powerful tool.
For example...
Pick an instrument that trades in ranges.
Limit the amount of times you average down. If you regularly trade 4000 shares of XYZ, don't go beyond 4 x 1000. Plan your trade, and trade your plan.
And last but not least, your MOST important, never average down OUTSIDE of your initial stop area. If you are stopped out, it's over, regardless if you did, 1k,2k or 4k shares.
Hope you get back on your feet.
Good luck.