You may not realize it, but a lot of your issues likely come from sizing too large and setting your stops too tight

You need to give trades room to work

You size too large because you want to make the most amount of money possible in the least amount of time

Sure on MNQ you can make a quick $150 on a 25 point move with 3 contracts, but you could also make the same amount with 1 contract on a 75 point move, it'll just take slightly longer and you'd need more followthrough.

But it's much more mentally healthy being in one trade and letting it work, rather than sizing into a trade and either making a lot of money or being in ruin within 3 minutes

Also this may just be my opinion, but being able to capture larger moves points wise would build your confidence a lot better than taking sized up gamble trades that make or break you within one 5 minute candle

Your stop would be wider giving the trade more room to work, you'd stress less with each tiny fluctuation in price, and your PNL curve would be much smoother instead of big jagged ups and downs