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.
Just relax and don't get frustrated and you'll experiance what I mean in due time.