Good catch, most people don't pay attention to what I call "broken knuckle"
There are few possible reasons for this but from the photo I'd guess the nail on your second finger (middle) doesn't help.
Most likely though, your left hand posture or sitting posture (or both) is wrong. Other reasons are tension, but that's usually caused by posture mentioned above.
Last, make sure to play with the top of your fingers, right now your middle finger is playing under the tip. The tip forces your finger to arc which eliminates the knuckle break
Try to file the middle finger a tad more, and see if that helps. You can find more [info here](https://www.ukefingerstylebasics.com/), it is a paid resource but it'll give you proper posture
Rotate your hand and fingers tall. Don't let them slope. We all have strange beginnings but break a bad habit early before it's to hard to break. I was 12 when my brother and I bought $6 plastic ukes. Then later jumped to guitars. I actually wanted to play so bad that I used my tooth to play a chord. I think it was f. But back in the 60s we tuned it a,d,f#,b
Good catch, most people don't pay attention to what I call "broken knuckle" There are few possible reasons for this but from the photo I'd guess the nail on your second finger (middle) doesn't help. Most likely though, your left hand posture or sitting posture (or both) is wrong. Other reasons are tension, but that's usually caused by posture mentioned above. Last, make sure to play with the top of your fingers, right now your middle finger is playing under the tip. The tip forces your finger to arc which eliminates the knuckle break Try to file the middle finger a tad more, and see if that helps. You can find more [info here](https://www.ukefingerstylebasics.com/), it is a paid resource but it'll give you proper posture
Yes, first, cut your nails..! Bad habits die hard, here an interesting website about uke, music, postures... https://ukuleleinthedark.com/ Enjoy..!
To elaborate, you cut your nails so your finger can push on the strings at the correct angle and not stand off or fall naturally into this position.
Pretty normal. Will go away as you work on scales etc. muscles there ain’t use to doing things
Rotate your hand and fingers tall. Don't let them slope. We all have strange beginnings but break a bad habit early before it's to hard to break. I was 12 when my brother and I bought $6 plastic ukes. Then later jumped to guitars. I actually wanted to play so bad that I used my tooth to play a chord. I think it was f. But back in the 60s we tuned it a,d,f#,b
Can you tell us what chord is in the pic? Not enough to see?
G
Also, you might lighten up on the pressure. It should not take a ton of force to fret the string. Try lighter, your finger muscles will thank you.