This question comes up quite often: how to use Instagram to share YouTube content, how to use Twitter to share YouTube content, how to use FaceBook to share YouTube content etc etc.
YouTube is the only platform that is designed to share YouTube content. Each platform is best deployed for the purpose for which it was designed. As
@chubbybots rightly said, Instagram is good for posting behind-the-scenes photos and for building your brand, but it is in no way designed to share YouTube videos. Facebook on the other hand is at loggerheads with YouTube and needs a totally different strategy altogether, and Twitter...I haven't really figured out yet although I think I'm getting there.
If you think about it this makes sense. The creators of Instagram don't want users to leave their platform and go on to another social media platform. The same goes for the creators of twitter and facebook. It is worth taking the time to understand exactly what purpose each of these platforms serve, and then exploiting that to build your community and your brand.