I'd be more concerned about WHY you got held back twice. Especially if you plan on going to college. College admissions directors and staff WILL TAKE notice of you being so far behind your peers, and they WILL ask you about why that's the case. And you'd better have a good answer, or you'll be denied admission, period.
Being held back, especially for more than one year, has a stigma attached to it. It says a lot of things about you, most of which aren't good. I'm not unsympathetic- I got held back a year myself, in second grade, and the experience haunted me for the rest of my school years. I was even asked about it repeatedly in college, as you will probably be. It's not a pleasant experience.