Is this game just not accessible to new players?

I am Masters in SCII but I just can't win a single match in Broodwar, I am like below 1000 MMR in F rank and win like every 10th match is with someone remotely close to my skill level the rest just completely mop the floor with me.

I am kind of getting discouraged from even trying anymore..

Edit: Thanks for the advice everyone, the best fix for now was as a user suggested to just delete my profile and make a new one. F rank is harder than E rank.