If you think someone’s cool you can just ask them to study together outside of school or grab a drink or bite afterclass
. One major thing that helped me was I dont hate being alone coz I keep myself busy. Im extroverted and have been struggling in the past to form good and healthy friendship. My advice, be confident that you’re an amazing person, dont be shy to initiate first interaction and proposing activities. Always respect yourself and demand respect by others even if you really wanna be friend with them. This might be my personal trauma speaking but never force it, after a certain time if they like you and want to kick it with you they should show it and ask you. If not keep some distance. Good luck homie.
Ps: It goes without saying but you need to be somewhat interesting to have friends so live a rich life full of experiences.