Shall I send friend request to my teacher on Instagram who is also my crush?

So this guy is 4 years older than me and teaches me in self development class. We see each other every day (online) and also have talked but it's mostly formal. Shall I send him a follow request on Instagram or Will it be too personal and weird? Also we know each other since 4 months but nothing too informal has happened :(
Shall I send friend request to my teacher on Instagram who is also my crush?
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