my baby never seems to be full........

Hi Moms, I'm feeling really confused and a bit overwhelmed. My baby is 3 months old and he never seems to be full. He cries for feeding all the time, and the gap between each feeding is very short. Sometimes it feels like I just finished feeding him, and he's already crying for more. Has anyone else experienced this with their baby? Is this normal, or should I be worried? What can I do to help him feel more satisfied and maybe lengthen the time between feedings?