That's all I have been doing. Some of my stats are really low.

well you're still early in the game
my first playthrough was like 80 hours

I'm trying to get a social link but X stat is too low.
I try to take the job to raise X stat but Y stat is too low.

read books sometimes and read hyperspeed reading asap cause lets you read 2 chapters per night

Why is everyone's name Yu? Is that what the mains name is supposed to be?

Any good strategies for taking down Shadow Teddy? I am level 30. I am using Yaksini with the move that adds 50% more ice damage and the ring that adds 25%.

Ya main character's name is Yu (sometimes spelt as Yuu)
Well Shadow Teddie drains ice so that's a bad idea

some tips: Buff MC or party if you have party buffs (i always do at least MC since i have buff all single target, but later in the game a party member can get a party wide one), if you can use Mind charge if using spells, power charge if melee, sometimes lowering enemy stats is good (like buffing i tend to always do this since i have debuff all single target, in your case attack or def should be good enough if you can), don't be afraid to heal all the time if you really need too, shadow teddie is a boss that has a charge up that takes 2 turns for him to use so have everyone guard before the turn he unleashes it
another good idea is have Ice Break to break his resistance to ice and if possible keep a magic deflection on Yukiko since she's weak to ice so if he attacks her he hurts himself as well (instead of healing himself)

Just barley squeezed out the win against Teddie. In my inexperience I got rid of most of my parties buffs.

bad idea cause this is a game where those buffs are like the best thing ever cause this is a game where being overlevelled isn't always a big help

It's definitely forcing me to get creative with my main. For some reason I thought you could give skill cards to members too. Hopefully Teddie has some good buffs.

Well personally I've never been a fan of using Teddie/Kanji much
But Yosuke gets party wide hit/evade at 60, Teddie gets party wide attack at 42
Teddie is an Ice based healer (which tends to be why i don't use him cause Yukiko is better IMO) and only one i'd replace for him is Chie who is my melee damage dealer (she gets better attacks than Kanji does and she can get 1 of the best buffs near the end)
Personally I'd say you're the best choice for having a persona for buffing (or maybe 2 for it)

also here's my general idea of what I use
a buff/debuff persona (you'll need to make this one for Margaret) < this is also my main almighty spell user for taking out the gold hands
another persona I use just because he's awesome also can buff (Max Jester SL to be able to get him)
a Wind based Persona (Amp and Boost stack)
An Elec based Persona
a Fire Based Persona
an Ice based Persona

most of them have a melee skill mixed in (I have yet to make a primary melee damage based) and the elemental ones all have the single target Severe damage spell (pretty sure can't be transferred and they are the only ones to learn the severe one)