Real iron man suit possible in the close future?

What you are asking will be near impossible or require an enormous sum of investment, research, and time. First, you are asking for a near impregnable armor, while giving iron man power and movement. The strongest known metal is probably titanium, and titanium isn't a light metal and even then you would require a lot of it. Second of all, assuming you have titanium and managed to develop it, you need motors or engines to move the thing, while compacting it down to the bare minimum. Also, the portable nuclear power is NOT in the near future. The problem with the nuclear power is how to safely get the energy from nuclear fission, which is why we build huge nuclear power plants for a reason. Adding in the weapons system, your iron man might be immobile, extremely slow, or huge.