I feel the same way as you. If you chronically "empty" inside and kinda feel aimless/lost with who you are as a person, I would look into BPD (borderline personality disorder) and DBT therapy. Just looking at free DBT workbook online might give you a better way to process your feelings of loneliness, and your relationships with others. Also, some people just have a people-pleaser personality. I have that, and I feel lonely often because I only feel like a useful or functional person if I'm doing something for someone. Short-term, being actively distracted with video games, physical activity, doing hobby/skill, etc helps. Sitting and watching a show or listening to music is not enough for the lonely feelings to go away, its best to avoid stuff where you could think about people and your friends. Long-term, I hope you feel more comfortable being alone, it's hard being your own friend sometimes.