How to move on

Mariah • I`m a 16 year old loner that likes to sleep, eat, listen to music and play with my cat.
How do you move on from your ex that you haven't recently broken up with, one that you have had feelings for for a long time? He's my first love and I don't know how to get over him, especially since I haven't had any successful relationships after him and I'm not talking to anyone now. (Also I lost a lot of friends, so I'm very lonely and not in a great place right now) I'm trying to stop checking his social media, but what else can I do?