Scarring requires time for it to fade. Depending on the severity, they may never go. If you're not totally committed to tattoos, tattoo sleeves would work for forearms.
An alternative to tattooing that may or may not be an option, depending on the position and severity of the scarring, is scarification. I quite like it, but it requires a skilled person and hygiene standards equal to those you would expect in a hospital.
Both tattooing and scarification demand your personal commitment to not incur further damage. If your scars are 11 years old, then I am assuming you have worked through that behaviour. Good job!!
In all honesty, it's a part of who you are and the best thing would be to own them.
Providing they are scars and not fresh cuts, it's a part of your past. Something you have overcome and that's nothing to be ashamed of.
Think of some ways to deflect unwanted questions like "what happened there?".
I like "I had a fight with Edward scissor hands"