Idealism vs. Realism

I get this from time to time that I am a very idealistic person. People say that I should be a lil' more realistic in my thoughts and approach. I thought about it for a while and I believe I look at things a little differently. Atleast thats what I think.

I believe that everything is a possibility. Some ideas are more probable/doable/achievable than others by some. So realism or idealism is an individual perspective. Its not the idea or the thought that is realistic, rather the person thinking that thought who decides according to his understanding and thought process whether something is real or idealistic. So I believe that if you stop categorizing an idea as idealistic or realistic then there is a chance that you might think of a way to achieve it. Its a possibility and sometimes answers lie outside the boundaries.

Another difference I see is that ideas become idealistic when people donot see ways of realizing them. Just because there is no path up the mountain doesn't make a mountain unclimbable. The brave and courageous still do it. They create a new path. But if you think right at start that the mountain is unsurmountable then you will never even try.