I feel lonely sometimes

To me, the people around me are constantly telling me I'm blessed to have such good friends, and am blessed with such a good family. Im grateful for all of that, but i think that what people dont know is that i feel lonely sometimes. Even with so many people around me, I'm always overthinking about things and making myself unhappy. It is not that i crave for more, I just feel that sometimes i dont appreciate the people by my side as much.