Ive donated twice before I decided to have kids myself, the first time I did it,I had a partner, he didnt like the 'procedure' injecting, hormones etc, once we broke up I was off like a shot to the clinic to do it again
Its invasive and can be uncomfortable but the idea that you are helping a well deserving couple achieve their dream of having a child, for me outweighed anything else.
My daughter and soon to be son have technically 4 genetic brothers out there as each couple had twin boys

I dont see them as 'my kids' they just have some of my genes
My ideal world would have been 3 of my own kids, much earlier of course lol, egg donor and surrogate