(Hold up an envelope that has been delivered by mail)
Scouts, the postage stamp you see on this envelope was given the job of making sure that this important piece of mail was delivered to me. The stamp is pretty small but, in spite of its size, it did the job.
In your patrols, each of you has the responsibility of "delivering the mail" in order that your patrol becomes a success. Like the postage stamp, it isn't your size that determined how well you do the job, rather, how well you stick to it.
We can't all be good at all things. Some are better at physical skill, some at mental tasks.
Remember the stamp. It did the job in spite of its size by sticking to the job. Make up your mind that you can do the same thing. Just determine to do your best - and stick to it until the job is done.