I’m confused

I don’t know why I have felt bad all this time. I don’t even know why I’m currently feeling so down. Looking at my life, you would say that it’s a really good life. Yeah I do have my ups and downs, but I come from a rich family, I have straight A’s in school, I have tons of friends, I’m usually always in a relationship, whether serious or not, I’m an outgoing, friendly person, I get invited to parties, and  I’m really athletic. I play basketball, tennis, soccer, and swimming weekly and If I’m not exercising, I’m hanging out with my friends.  So why is it that I feel so terribly lonely everyday? I can open up to a few of my friends about anything bothering me. There is absolutely no reason for me to feel bad. I really don’t know why … Sometimes I would dream about going to my own funeral, just to see who would be there. Just to see who would cry. I know that there would be people there crying, but who? I just feel lost. Really lost.