Get a hair oil — we particularly love the Uma Intensely Nourishing Hair Oil, $70, if you're looking for options. Before you go to bed, or even before your shower, take a couple of drops and apply to dry hair. Massage into scalp and brush through your strands. It feels oh-so-good and your locks will thank you.
Countless studies have shown that being in nature lowers stress and anxiety levels. So find a patch of grass, take off your shoes, and let the blades tickle your toes for ten minutes or so while your face soaks up some sunshine.
Buy a nice pair of underwear — for yourself, no one else. Make them cute and comfy (maybe something like these Honeydew Intimates Ahna 3-Pack Hipster Panties, $33). Every time you get to put them on in the morning you'll start your morning off on the right, erm, foot.
Learn to knit or crochet. Ask your mom or grandma to show you how (if they don't know how there are countless videos on YouTube), and start making a scarf for next winter. This does double duty: It is an absurdly soothing activity AND it keeps your phone out of your hands while you're watching Netflix/riding the subway/waiting for your friend to show up.
