Younger self: Assure him that there will be better days to come. Teach him a few techniques for self-defence as well and hope his сердце will be trained enough to express himself when needed.
Future self: Remind him that he had lived through better days at some point. It still is possible. Take a break together to do things we Любовь in general !!!!
Just go full on goth. Right away, don't wait just go full on goth. And be еще persistent in begging to see Тату in концерт because they'll disband by the time you're 'old enough'.
@future self; moar concert. Attention whore harder at сказал(-а) concert. Also pls finish fanfic. Thx.
To my younger self; Ты may be a bit of a crybaby currently, but don't feel ashamed to let your emotions out. One day, you'll end up where I am now haha :) Fight off those bullies! Don't do it physically though- Don't worry about your weight so much, it makes you, you~
Future; Hello me, I don't know where Ты are now, but I hope Ты are doing good. Although Ты might be struggling with something, don't be scared to speak to someone about it. Be yourself, and don't try to become someone Ты can't :D