For an earth quest, I tend to think Unicorn Mustang will do wonders as your tank and if you add in the Chaos Legion healer, you might have some better luck. At least that was my recommendation to my friend who plays with level 1 summoner and it seemed to work out for him.
I don't really blame you for feeling bad at losing. Just take your time but the game has definitely gotten tougher as the player base went up.
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From time to time I indeed use Unicord Mustang, but mostly without a healer. Sometimes it helps, sometimes not. Maybe I am just too tired of the struggling for nothing. Either way, I will probably keep playing Splinterlands after a short break.
Good luck and have fun.