similar to the above comment, i was given them the same day i saw a new gp because she looked at my notes and saw that id had a few appointments about it before. you may need to be 18 too, but i was about 17 and a half when i got them
i know it’s easy to think that pills are the best option but even if you were to be given them you may have to try a couple before you find one that works for you. definitely try to see your gp, even if they won’t medicate you it’s worth letting somebody know how you’re feeling. they’ll definitely recommend something for you if you’re honest with them
alternatively, i know a lot of people swear upon st. john’s wort which is an over the counter natural remedy. i’ve recently come off of it and i feel as if it has boosted my mood a bit, but i personally just don’t like the feeling any ‘antidepressant’ type things give me. though as i said, i know a lot of people love it. regardless, good luck ❤️