Do you have a good friend who could walk you down the aisle? Or some younger bridesmaids and page boys who could do so?
As for the speeches, it's your day, you can choose what speeches you have and by whom. On my wedding day, my mother did my father's speech (he was there, he was just too nervous). At the last minute my groom announced that he didn't think he could do a speech either and I had to grab the best man and tell him to announce me and not the groom. It was nearly the shortest marriage on record.
It is your (and your intended's day), you choose what you want. Best of luck and congratulations!