Is it possible to change your accent?

If you move before you are about 11 years old you have a good chance of having a perfect accent. Otherwise, it's highly likely there will be a trace of your original accent somewhere. It would take vocal coaching to eradicate it. 

Yes. Actors can do it, so why can't you?

Yes, it's called studying.   How do you think it is done when an actor is acting?   Remember movies?  Do you think those actors are really from a country they are portraying?    Tell me you are kidding?  Tell me you really don't think that a language with all its nuances, accent and all,  cannot be learned?  It can be learned.  Not by everyone, of course, but it can be.

STUDY and want it, and it can be done.

But aren't their exceptions because some people can learn languages perfectly! Also I want to be the most famouse person in Colombian history & when I die I have statue in my legacy it's I just want to be a legendary public figure in Colombia history. Also want to die in Colombia. But I want perfect my Colombian accent!

I want to be a legendary figure in Colombia & be most famouse person in Colombian history!

I want to be the most famouse person in Colombian history. Like a public figure in Colombia

Si

Yes, there are exceptions. I'm only telling you what is known through speech pathology. 

Écoute-la !

You are famous to me.

There are many Colombian accents , Mario.

It´s not just one.  They all change according to the region.

Pffft...... Same stuff, different day I see.

i think anything is possible