Hi, I’m am a builder home with the flu. While Brntuk’s advice is sound you can tell if it is definitely load bearing yourself if you have access to the floor above. Lift the flooring above and it the joists cross it at right angles, in particular if they are joined over the wall, then it is undoubtedly loadbearing. You will still need an engineer to proceed because removing it and replacing it with a beam requires planning permission

From your picture and judging by the lengths and widths of the rooms either side - and therefore the most likely direction the flooring joists above will run - I would be surprised if it isn’t a structural wall. But you need to lift the floor above to verify this.