How do I talk to him?

So I want to talk to my crush and e havw before but usually when we are in class sitting together we don’t really talk unless we are doing an assignment and I want to change this I mean I have 4 months left of this school year and I’m freaking out I won’t be able to ATLEAST get his socials but the major thing holding me back and maybe him is that I’m socially anxious and I just think he isn’t talkative and I’m just scared of talking to him because I’m scared i will be bothering him when he is on his phone or annoying him and idk what to do because my time is running out.