The only way for you to tell yourself is to take off the wall covering. This will expose the framing. If the frame looks to be nothing but single 2X4 or 2X6 construction, then it is not a load bearing wall. If there are at least 2 2X4 or 2X6's then it is may be a load bearing wall. If there are 3 or more 2X4's or 2X6's at the ends then it is most likely a load bearing wall. I have seen old 50's homes constructed such that all walls look like they are load bearing. I've seen some badly constructed/remodeled victorian homes that none of the interior walls looked to be load bearing, even when supporting a 2nd or 3rd floor. After you remove the covering, if in doubt call an experienced building or remodeling contractor. The roof or second floor structure/construction will be indicators of the bearing type.