Yes, it is true. Sometimes in the summer there is an unexpected wave of loneliness that can punch us in the face. It makes us feel awkward. And a little bit embarrassed. And maybe a little bit scared. Of what will come next. One could blame SAD (Seasonal Affective Disorder), a type of depression that follows the seasons. It is more common as a "winter depression", but there is also a summer depression (although more rare), and both are related to the changes in the amount of daylight we get.
Know Yourself. YOU are responsible for how you feel. The others behave in the way they want, but they have nothing to do with the way you perceive their behavior and consequently how you feel. It's merely your decision.