Yes, you can become a model at 17, and yes you can model for brands like Nike or Forever 21. You have to start with putting yourself out there carefully. At least start with a modeling agency, get into modeling for the runway, and commercials.
Once you have 10k followers, Instagram will make it easier for you to get people to your website via Stories with the swipe up to link feature. Swipe up is the only way to get a direct link from your Instagram to your other web properties. And, it’s available in STORIES, if you have 10k followers.