Originally posted by Harbaror I am just trying to understand if I should trust my camera's meter or not.
If there is a camera repair near to you, they may be willing to check your meter for free. Adjustment would be part of a routine CLA (clean, lube, adjust) which would also include replacement of seals and mirror bumper foam. Chances are that your meter is working just fine, assuming the batteries are good. I suggest using silver oxide (SR44) rather than alkaline (LR44) cells. They last longer and have consistent voltage until depleted.
When you get your film back, a good check for consistent exposure is that the frames on the negatives should have consistent density and not look "thin" or opaque. This is usually pretty obvious.
Have fun and don't worry too much.
Steve