I'm so upset please can someone help me:(

Okay so I've broken up with my boyfriend, but I'm so so upset I've cried almost everyday, I love him so much and I don't know what to do, he took up so much of my time and now there's nothing, like I feel like I hate life now without him, and no I can't get him back, he doesn't like me anymore and obviously I can't force him to, but I just don't know how to move on, I'm 16 yes I'm young but I lost it to him, and he was my first proper boyfriend, I am so upset:(( I just keep crying, I have memories of us on my laptop, videos and photos, we were only together for about 4 months so not very long but he was like my everything, he took up so much time and now I don't know what to do with it and never thought I would experience this, and it's hurts, it's making me hurt so much that I feel about hurting myself, and I won't because it's selfish etc but I just hate myself like I tried so hard, and love him, he said I was too immature for him, an I am quite tbh but I hate it, he said to my friend he likes my but he just doesn't want to be with me anymore, he's 18 soon, I'm so so sad like I don't wanna block him, but he's hard not to message, please be kind about this, it's never happened to me before so I'm so hurt, sorry I'm not asking for sympathy or anything, but I'm just crying and don't know how to get it off my mind please help me someone, please 😭😭😭