I think I will probably be walking myself down that aisle, as so far only my DH, our three children and one of their friends is coming with us. My children are all girls so they will be my bridesmaids so technically I will be walking down on my own. If I had one of my brothers there (I have 4, but not looking like any can make it) or if my brother-in-law could make it (he has been my brother in-law for 33 years, so i think he has some right by now ) he may do if he wanted too but other than that I wouldn't have anyone else anyway.
Also in my case it isn't giving me away (having lived with DH for 17 yrs), it would just be walking me down the aisle. I'm not bothered either way. As someone as already said, its your do, do what you want, do what feels right for you.