The stratagy of conflict in Budo requires thought. Why would I try to out box a boxer or submit a wrestler? You're just learning so it's good you're finding out this lesson early. The Folks here are correct about learning to play to your strengths not your opponents.Aikido requires an entirely different approach to "fighting" and if you were one of my students with no prior Martial Arts experiance I might suggest you get a "black belt" in something else first if you want to learn "how to fight". Then come to Aikido.
This paragraph sums up my mistake well. I tried to force Aikido techniques on a jabbing boxer; and they don't work well against jabs. Aikido seems to require a committed attack to throw an opponent off balance.
I wonder if my mistake was at a conceptual level; in the "approach" as you say. Boxing is the art/sport of landing effective punches on an opponent. Aikido is not designed for sport-fighting.