1. the things you may have as outlined in the OP are very, very different from each other, although naturally a lot of them are in the same spectrum. if you're confused whether you have all of them... i'm uncertain that you do. but you know yourself better than i do.
2. at your age, your brain gets a lot of emotions it's not used to handle; contrary to others, i think the hormonal aspect of it is overstated and unfortunately often used to dismiss real things as juvenile concerns (if it were just hormones, i've had hormones since i had a memory and beyond), but i believe the
novelty of these emotions is still a thing that you're not
used to handle, regardless of whether you're a healthy teen or not. most people get depressed during their lifetime, most people have periods or spurts of anxiety, most people get social cues they mistranslate or don't understand, and particularly during your teenage years, even as a neurotypical, figuring out what this is and how you react to it is a
normal part of growing up. like, not intuiting what a social situation is all about and figuring out years later that you completely misread everything is not unique to autism, it's part of the social calibration you go through.
3. as others have said, don't google your way to it, and don't rely on this forum for it. i'll add that even respectable sources use words differently than outside their sphere. Eg this
https://www.nimh.nih.gov/health/topics/depression defines one symptom of depression as "Persistent sad, anxious, or “empty” mood" among other things (many relevant things, but i'm picking out just one sentence here). the problem with psychiatriac speak is that a lot of the nomenclature is something we all feel sometimes (it's a big part of the reason it's so hard to translate these issues to people without these issues). when professionals mean persistent, sad, anxious, etc, they
mean it, and if you
don't have it and are not acquainted with what it "really" looks like, you can mistranslate for yourself and self-diagnose in unfortunate ways. on the other hand, if you
do have it, and are acquainted with what it "really" looks like, the reveal of what it means can be a tool for you to get resources and/or treatment.
(sidenote for this point, i'll add that of course there are plenty of people that realize what they've felt all along
is a thing after a bout of googling, but the point is that the medical language is very precise, even if psychiatry shares a lot of popular nomenclature when describing the illnesses. as a shrink, you need to translate the medical nomenclature "feeling sad" to common english "feeling sad", and one is a magnitude of severity worse than the other)
it's complicated, really, but i'd suggest just:
see a doctor about it (and even then, if you have something, may not be picked up.)
4. if you have something, getting a monicker for it/having it defined/getting diagnosed is,
in itself, useless. what it
can serve you is getting a sense of belonging, getting access to treatment (you don't get schizo pills if you don't have schizophrenia), and a shorthand in social situations for other (understanding) people if you have issues in some neurotypical spaces. all of these things can also work against you; you can get an innate sense of being sick and wrong, you can lose access to other aspects of life, and people can dismiss you by default if they know you have some mental ailment.
but the diagnosis? between yesterday and today, after you got the word attached to you? you're the same person, but you have a word attached to you.
basically,
i suggest you see a doctor and share your concerns,
and know that the diagnosis is just that. it's a pathway to many other things, but it won't change a damn thing in itself.
This is not helpful advice. It's like saying if you have to ask if you have cancer, you don't have cancer. There are many illnesses that don't have visible symptoms (at first), and ignoring them could lead to drastic situations later.
