do you think is fair that people should judge you

I guess they find it hard to forget what you did in the past. If you realize how big a mistake it was, understand that they can not just forgive you. Put yourself in their situations and you can see their points of view. I don't forgive others easily myself and so if I know I made mistakes intentionally or unintentionally, I go the extra mile to proof that I have changed. It's not right that they can't forgive and forget your past mistakes, but you can't say you didn't make the mistakes. Some wounds can only heal by time. What you can do now is continue the positive changes and face your challenges. Time will tell.

I feel it's not right to judge people. But on the other side I know how it feels to be judged for my mistakes in life and don't let me forget them. Being judged hurts more than anything special when it's people that don't know the whole story.

if i think that what i am doing is right then i just ignore them. i just say to myself whatever and keep on going with what i was doing. sometimes the people wont even make sense and are just sticking their nose where it does not belong. those are the people whe i usually dont take advice from either lol.

Well, as the common phrase states, "Life is unfair." I'm not sure what positive actions you're trying to take on in your life but as Shawn stated, if what others suggest or speak to you about is complete nonsense then just nod and walk away. If they keep trying to imply their opinions on you speak to them about it. Of course if they're doing that constantly then it is completely unfair. Whatever is in the past stays in the past, it can't be changed, what's important is the future and that can be changed according to your decisions.