Don't blame masturbation for this because masturbation is a safe way to satisfy yourself. It would do no harm nor any illness.
You can't decide for yourself if your size is small. Also, sorry to tell you but there's no way to increase the size of penis. Read about this here:
https://lovematters.in/en/resource/penis-shapes-and-sizes
https://lovematters.in/en/news/penis-top-five-facts
https://lovematters.in/en/news/worried-your-penis-too-small
https://lovematters.in/en/news/what-women-penis
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Don't blame masturbation for