How to approach a hallway crush?

So, I kinda like this dude right now. He's a senior in high school, and I'm a junior.

So how I started liking this guy is through my friend. My friend, let's call her C, liked him first semester of this year, and she told me about him. I didn't know who he was, and his name is spelled way differently than it's pronounced, so I never found out. C stopped liking him over winter break cause she met someone else and moved on. During the second semester of this year, I was talking to my friend during class, and this really cute guy walked in. He forgot his calculator and was there to ask his friend in my class to borrow one. Of course, I wanted to know who he was, so I texted one of my friends about him, and through her, I found out that this was the guy C liked the previous semester. My friend thought that this was hilarious, so she told C, and C actually kinda shipped it. C's told me so many things about this guy that I've actually started catching feelings for him and have been trying to figure out how to approach him.

Thing is though, this guy doesn't know that I exist. I have AP bio the same time he has AP chem, and both of those classes are 1.5 periods, so we eat in the cafeteria for half a period and then head to class. I try to time it so that we're leaving at the same time so that I can walk in close proximity to him, but he either leaves chronically early or chronically late, so that's been challenging. I don't have a single friend that knows him well enough to introduce me (C hasn't spoken to him ever), so I'm kinda on my own (I do have his instagram though, and he follows me back), and from what I've heard, he's super introverted–definitely not one for small talk–but is polite and a nice guy. I would introduce myself (maybe not actually, cause I'm also kinda shy), but he has a couple of friends in my bio, and I would prefer it if they didn't know about this. Any advice on how I can approach him?

How to approach a hallway crush?
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