I think my fellow commenter is right and I can only heartily agree. I would like to add some more points, however:i) It's okay not to be awesome. It's also okay not to be funny or skinny or whatever you think you are not. These are labels and expectations that you think other people have of you. This is not necessarily true (just ask them to summarize you in three sentences. You'd be surpised!) and not everyone can be everything. That's totally cool, too. Be only what YOU want to be and if you change your mind in between? Hell, why not? Because the things you listed are only tiny proportions that make up your personality and your life. Do not put them as the MOST IMPORTANT THING on the scale pan. Because they are not.ii) I got the impression that YOU got the impression to always be strong and at your best. If you are not, you feel worthless/pathetic (your words). Yet self-worth has nothing to do with work-performance or meeting someone else's standards. It is okay to be weak, and it is especially okay to admit weakness. Judgement comes from those that lack empathy. If you feel your grades define you in your parents' eyes, please do talk to them. I am positive that you will soon find that your grade performances are not the most important thing on their mind when it comes to you, even if perhaps the most imminent at the moment (as in: they are concerned for you and your future.)iii) last but not least: the way you feel and think creates an aura around you that others can feel. Especially those attuned to you and your character (here: friends). If you project unhappiness, self-loathing and hopelessness, others might distance themselves from you unwittingly and unconsciously out of fear that they might bother/annoy/anger etc you. They just might feel now is not an appropriate moment to approach you. You will only find out their motivations if you speak up and ask them.
Furthermore, there are friends and then there are acquaintances. Do not confuse these two types of people. Acquaintances are useful for non-committal get-togethers, a good time. Friends are for those and so much more. Find out who is who.I personally found that taking action was one of the more effective way to fight depression. Ask people out or even better, ask them why they haven't included you lately. Be confrontal. You might be surprised what comes of it, but I promise you: the truth is always the best solution and the most rewarding in the long run.I wish you the best of luck. I believe that you can find a way out and if you feel overwhelmed, always *always* talk to your parents and friends, even if you fear you might "bother" them with it.