A lot of the bad feelings we get from those closest to us, who we so want to understand us, is as CLKD says, coming from a place of fear. Not only in a selfish way, where we don't want to have to cope with others' problems, but because of projection and reflection where we are reminded of what we may become!
Its one of the main reasons people are so obsessed with how they look today. They hear others' derogatory comments about ageing and they are then thrown into a need to NEVER look old because they believe not looking young and vibrant equals not being wanted. We then repeat the derogatory words about how bad it is for us to look old, someone else hears and the cycle continues. Its a complete media myth that we've all become dragged into - including men these days. No-one actually really cares about us having a few wrinkles or not being slim. We are not models and, unless we are trying to attract one-night stands, then we also aren't simply a sexual being!
Your experience in life and your developed personality, even when you're having anxiety rushes, is so much more interesting and important than a sexy pair of legs.
Its true that not everyone appreciates these facts, but the ones who don't are also suffering and stuck in this false turmoil about how they look and 'appear' (in terms of confidence) and don't want anyone, particularly their own mother, reminding them of what might also change for them. Those who are above this fallacy are the true people to invest your time in at this time because they will appreciate the richness you have to offer.
Vulnerability is a beautiful thing, it takes bravery to be vulnerable, to admit to your weaknesses and your insecurities. We cannot strengthen until we admit and accept our weaknesses. Many young people will not get this, please do not take their ignorance to heart as they will hopefully eventually start to understand - that is their responsibility though. Be true to yourself, not a 'fun front' that doesn't complain and blends in with others so they invite you out, you are so much more than that. Remember, Facebook is one big front and doesn't tell the true story behind the event, just a second captured on camera when everyone was told to smile...
People generally don't mean to be so cruel, they just don't understand and are getting it wrong themselves. You guys are wiser remember and SO much stronger than you think.