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My first advice is never ever let frustration get in the way your learning to play guitar. Now about frustration: is not being able to play something causing frustration? It took me a good deal of time to be able to identify my own source of frustration. Try to figure out why you are frustrated. It went way beyond not being able play something for me. If you want to talk through it we can chat on message if you prefer or forum, whichever makes you more comfortable.
For power chords two or three finger….both have their advantages. If you have nailed your two finger down and you are satisfied with how it sounds, carry on! At some point you may have to learn the three finger method because doing it with two won’t work but, that is not today so play until it doesn’t work, then find a new way unless curiosity gets the better of you and you learn it just to compare.
Fast progress to you.