If you are in a flat, go upstairs and talk to your neighbour. Establish if there is a wall in their flat directly above the wall you propose to remove. If there is no wall above then your wall is not load bearing. Therefore it is NOT load bearing. If they do have a wall, then yes your wall is load bearing. Then you need the services of a structural engineer who will apply for a building warrant to have the wall removed. Then you need a reputable builder to remove the wall.
If you live in a house, just pop upstairs and check for another wall directly above. The same facts above should be applied.