I can offer some possible explanations for your feelings:
Emotional Exhaustion: Some people are more introverted and find social interactions draining, even if they enjoy them. This exhaustion can lead to feelings of sadness or a need for alone time to recharge.
Social Anxiety: If you experience social anxiety, hanging out with people might trigger anxious thoughts and emotions. Afterward, you could feel drained and upset due to the stress of managing social interactions.
Comparison and Self-Criticism: Sometimes, being around others can trigger self-comparison and self-critical thoughts, leading to feelings of inadequacy or sadness.
Unresolved Issues: Social interactions may remind you of unresolved emotional issues or past traumas, leading to feelings of sadness or distress.
Fear of Rejection or Abandonment: If you have a fear of being rejected or abandoned, social interactions might trigger these fears, even if they are unwarranted.
Overthinking: Ruminating on social interactions and analyzing everything you said or did can lead to negative emotions.
Lack of Fulfillment: Despite enjoying the company of others, you might still feel unfulfilled or disconnected, which can lead to sadness.
If you consistently experience sadness after social interactions and it's affecting your well-being, it could be helpful to explore these feelings further with a mental health professional. They can help you gain insights into the underlying causes and provide appropriate support and coping strategies.
In the meantime, consider practicing self-compassion and being gentle with yourself. It's okay to feel this way, and taking some time for self-care and reflection after socializing might help you process your emotions better. Additionally, setting healthy boundaries for social interactions and making sure you have enough alone time can be beneficial for introverted individuals. Remember that seeking support from friends, family, or a therapist can be valuable in understanding and managing these feelings.