1) Your case is so small airflow is suffering as a result
2) You've a stock cooler in a small case, airflow suffering as a result
3) Your cooler is naff
4) Depends on your make of CPU - some run warmer than others. i7's for instance run at 40C at stock with good airflow. If your case is small then that number would of course be higher.
So the baseline is:
More info please. What CPU is it, what do you have cooling the thing, what is your case and do you have any fans in that case moving air around?
when i'm just browsing the web and simple stuff like that, my CPU is at 50-60C. i have no clue what's wrong, any ideas?
Well, I'd first check to make sure that your HSF is firmly stuck down. Did you apply thermal paste properly? You don't need much. If nothing seems to fix it, then get an aftermarket cooler and see if that sovles your problems.