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 ハート, 心 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 愛 in general !!!!
Just go full on goth. Right away, don't wait just go full on goth. And be もっと見る persistent in begging to see t.A.T.u. in コンサート because they'll disband によって the time you're 'old enough'.
@future self; moar concert. Attention whore harder at 発言しました concert. Also pls finish fanfic. Thx.
To my younger self; あなた 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 あなた are now, but I hope あなた are doing good. Although あなた might be struggling with something, don't be scared to speak to someone about it. Be yourself, and don't try to become someone あなた can't :D