I have 3 cavities, which they told me i may not need anesthesia for 2 of the 3. is this a normal procedure cuz i thought it was always used?

Not always: Some patients prefer to avoid local anesthesia and usually don't require it. Others want to make sure they are 100% numb even for a pinpoint cavity. Most are somewhere in the middle. Everyone is different and there are no rules or right and wrong. Sweet air (laughing gas) is another alternative or aid. It's quite plausible that for a very small early cavity nothing is required.

Normal: Anesthesia is not always necessary. It depends on the patient ant the procedure. You may not need an anesthetic, even though you think you might need one.

Talk to dentist: Some dental repairs, including cavities, may not require extensive drilling and so can be done without local anesthesia. Talk to your dentist about your concerns.