I grew up in the city, so i have no clue about sheep, goats, 'kids', or lambs (I don't even know the difference between each of the 'types' that I've just listed!). But in the culture that Jesus walked around in, there were sheep and shepherds all over the place. So he used sheep and those who cared for them - shepherds - as a "real life" illustration of how God interacts with you and I.
"Come, let us bow down in worship,
let us kneel before the Lord our maker;
for he is our God and we are the people of His pasture,
the flock under His care."
Psalm 95 vs. 6-7
We are God's creation, He made each of us and has had a plan for our lives in mind even before He'd made us. Sometimes it can feel like we are going totally off track but God is our shepherd and He is always close by to keep us from wandering too far.
Sometimes a sheep needs a good prod to make it go. Sometimes it needs to hear the gentle, caring voice of it's master. The image of a shepherd is so often used because it demonstrates so many sides of God's character.
In God we have everything we need, whether it be discipline or a demonstration of love.
Read Psalm 23.
As you read, thank God for His love and if you are feeling in need, ask God to meet them and fill you with Himself.