I feel like i'm a person without talent/passion, and is EXTREMELY depressed because of it?

Right now i'm literally spending every second of my life downplaying myself, really getting depressed why i'm such a talentless person. I'm 21 years old guy by the way, just about to graduate my bachelor program. I'm just so envious seeing all my other friends (especially the guys) have something that they are clearly passionate about and can be proud of. Every single one of them is at least good at some kind of sport or can play a musical instrument really well.When i look at me, I literally cannot answer the question "what can you be proud of yourself?" because I really don't have any talent at all that i can show to people at all. it's so depressing when I think why my parents didn't encourage me to go to music/sport organization like other parents did. What's making it even more depressing is that I just can't find any interest at all at the moment, I don't feel like I found something than I like. All I am is just an average looking, nerdy guy, who enjoys sitting in front of the computer and playing games (not something that can be proud of). Nothing more. So freaking sad :"(. Any suggestion? How to even know that you are passionate about something?