Is it easy to apply for a Canadian personal tourist visa if I have an American F1 study visa?

Theoretically, you can apply for a Canadian individual tourist visa no matter what, but:

It is recommended that you apply after you have completed one semester and provide proof of enrollment, transcripts, and tuition fees. Receipts, as well as your F1 visa, certificate of deposit in a U.S. bank, etc. (this series of materials proves that you will return to the United States)

Don’t let the Canadian visa officer think that you are suspected of staying in Canada.

You can apply for multiple round-trips, usually 3-6 months.