Break up, nobody taking me seriously

I just broke up with my boyfriend about 3 days ago. Well he broke up with me. He was very important to me and I loved him a lot. My days feel so empty without him. I see him in the halls at school and it makes me so sad. I overthink all day now. I'm only 14, so my parents are laughing at me saying it's not that serious, and I'm too young to feel this way. I miss him. I'm tired of nobody taking me seriously:(