that's alright! a 5% is infinite times better than 0% ;) Will probably not make you a millionaire but it put you in a better position than without it.
I'd recommend not getting stressed about people getting a million% extra, if the story really is true they're outliers and there's a natural bias for those stories to surface faster (or there's more to the story).
In my case, as I've gained experience that percentage has increased, specially when prioritising good experience over just pay at the beginning.