Gender of Hindi words?

I'm Japanese and interested in Hindi. I've learned that Hindi words have gender. It is not easy for me to understand the gender because in Japanese there is no grammatical gender, just same as English. When I don't know / remember the gender of a Hindi word, how can I distnguish the gender? ex. My... show more I'm Japanese and interested in Hindi.
I've learned that Hindi words have gender. It is not easy for me to understand the gender because in Japanese there is no grammatical gender, just same as English.
When I don't know / remember the gender of a Hindi word, how can I distnguish the gender?

ex.
My cat is in the house.

Mera billi ghar men hai.
Meri billi ghar men hai.

Which should I say mera or meri when I don't remember the gender of the word "billi"?
Are there easy ways to find the gender of a Hindi word?
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