Your thoughts, your fears, your emotions, your struggles, your views of the world, they're all valid. Every tear that could ever fall from those pretty eyes is reasonable (even if that reason is as simple as "I just needed a cry today" or a chemical imbalance, or anything. Even if you don't know the reason. It's reasonable and respectable.) Every shout of frustration is valid, we've all been there. Every time fear prickles your chest, it's valid, there's reason, and it's okay.
And that goes for positive emotions too. Every time something makes you giddy, even if it seems simple, well damn me on the spot if that isn't good. Things that make you feel the way they do are valid.
All of your opinions and preferences are valid. Democrat, republican, third party? All valid ways of looking at the government, at the world. American? French? Japanese? Moroccan? Tamaranean? All those backgrounds and races and cultures are valid. Every color under the rainbow is valid. And so is every sexual preference and gender identity. Cis and trans are all valid. Any preference for anyone is valid. Girls, hell yeah girls are hot as hell. Boys? Hell yeah, boys are freaking rad! Nonbianary? They're all freaking great! Just people you love and trust? Well dag-on kiddo me too! It's valid. Aro? Ace? Hey you are doing perfect, (and saving yourself a bunch of cash because people are expensive(; ) Questioning? Totally understandable and valid and it's okay to not know. Prefer labels? You go! Want the world to be label free? That's a great way to think too. You feel how you feel! And think how you do!
If you prefer cloudy rainy days, hell yeah, rain is important and pretty! If you like bright sunny days, then boo-yah get it and make sure to wear sunblock! Prefer books? Don't strain your eyes boo! Prefer movies? I'll get the popcorn (or whatever you want to snack on or not, hell, I can just grab a blanket if you want.) Like the video games more? I gotcha, let's kick butt! Analog clocks? Get it bud! Digital? Totally neat! You like a cool house or a cool shower? Cool dudeman/dudette/dudeperson! Like warmth better? I've got a really great jacket if you ever need because I like warm jackets and cold houses, and that's valid too! Like it a solid 71 degrees Fahrenheit? That's rad too! Fahrenheit is valid, and so is Celsius!
Do you wanna go on an adventure? I'll grab you a map. Wanna just stay in and enjoy the little things? I've got this awesome blanket you can borrow. Naps? Valid. Insomnia? Valid (but I hope you get enough sleep, buggaboo, I don't want you getting sick.) Do you love every moment? Do you love looking at nature and taking in the simple beauty of everything? That's wonderful and reasonable and valid. Do you like to just go where you need to go and not worry about the scenery? Valid too, as long as you're happy! Every type of music under the sun is great. And every silence is great too.
Sometimes people aren't gonna understand. In fact, no one can really understand exactly your perspective. And it's valid to be frustrated with that. It's valid to feel like there's someone out there who can totally get you too! I know I can't ever understand, but I always want to try because people are worth a lot, even if I'm not very good with them.
Are you confident and sure of yourself? Get it, dude/chick/totally rad person! That's valid. Insecure? That's valid too, every one feels that way some times, and some feel that way all the times. It's okay to not be okay with yourself just yet. It's okay to not know who you are or to feel like you're just another number: you're so much more than a number but feeling like you do is okay. And, sweeties, it's okay to feel nothing sometimes. I've been feeling that for a while and I personally think it sucks-- but if it's keeping you safe, and it works for you, then that's valid. It's valid to not be comfortable around people. It's valid to be paranoid sometimes. It's valid to be depressed. It's valid, it's reasonable, it's life. It's okay to be okay! And it's okay to be not okay! Just live your life: every thing you go through and feel is valid. You are valid.
Don't give yourself too hard a time for feeling a certain way because you "shouldn't" be, or for not feeling a certain way because you "should" be. Emotions are finicky, and however you manage them is totally great and reasonable and valid.
(Remember, though, that just because your feelings are valid doesn't mean you should always act on them-- I don't want you hurting yourself ever, okay? Or others. I want you to be healthy! You're wonderful and deserve more than that. You deserve healthy relationships and sunshine or shade if you prefer.)