How to approach a guy?

So there's a guy, who just joined our class. He seemed to be nice and a bit introverted maybe. But the day he joined I noticed him and the thought of being friends with him just strike my mind. Now it's been a week, I'm still trying to find a chance to talk to him but I always end up retreating from it at the last moment. I mean I missed some golden opportunity here and there and after coming home, I just regret for not being confident enough to approach him. You guys won't believe it but I always rehearse on how I'm going to talk to him and all but at the end, it's just too hard. So, help me please!πŸ₯ΊπŸ€ŒπŸ»
How to approach a guy?
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