From the different outcomes of your photos, I looks like a problem with the focussing system. The lens itself seems okay, as the cat photo shows. All the other photos are blurry (de-focussed), and the different degree of blurriness can be explained with the lighing conditions: bright light makes the camera use a smaller aperture, thus making focus errors less visible (greater depth of field). The inside shots are worse than the outside ones.
I'd recommend to do some systematic focus tests. This costs you one film roll.
Select a scene where you have objects in different distances, from 0.5 meter to infinity. e.g. a brick wall or a regular-tiles pavement, something where you can later identify the various distances.
Make sure the scene is not in bright sunlight. The camera's exposure system should not stop down to f/22, but shoot wide open, ideally at f/2.8.
Then, take photos of the scene with different focus ring settings, from 0.9m to infinity. And note down the settings you used (or place a marker in the scene at the place that you expect to be focussed).
When you get the photos, check which part of the scene is sharp.
- Does it even change with the focus setting or does it stay the same? That hints at the focus system being stuck, or detached from the settings ring.
- Where is the focus relative to your expectation? If the "sharp distance" changes with the settings, but is always closer (or further away) than your expectation, then it might be possible to recalibrate it.
Anyway, you will probably need a technician to fix the problem, and you have to decide whether it's worth that effort.