How are the sizes of condoms divided?

Patient's question:

Living with my girlfriend, I often need to use condoms. I know that condoms come in different thicknesses but didn't know there are also sizes. No wonder sometimes they are either too big or too small, making it uncomfortable and not enjoyable. I feel too embarrassed to ask the salesperson, so I'd like to consult a doctor for an explanation.
What kind of help do I need: How are condom sizes categorized?

Doctor's answer:

Analysis of the condition: As a contraceptive tool, condoms are more convenient to use compared to other contraceptive methods, with no side effects, and the contraceptive success rate is generally 85%-90%.

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