Why am I so worried about everything?

Darling, God loves you unconditionally. Even from the day you were born/made he loved you. It doesn't matter what you do, what you think, as long as you believe in Him, He will still love you and thinks no different. Don't be worry but be happy because that's what he wants for you :) Stay smiling!

God thinks that you are His child and no one can replace you. You are His beloved whom He loves so much that He sent down a part of Himself just so that you could spend eternity with Him. You are that special and that precious to Him. Focus on those FACTS and you'll be okay. Trust in the Lord with all your heart and lean not on your own understanding. In all your ways, acknowledge Him and He shall direct your paths. Proverbs 3:5-6My sheep hear My voice, and I know them, and they follow Me. And I give them eternal life, and they shall never perish,; neither shall anyone snatch them out of My hand. My Father, who has given them to Me, is greater then all; and no one is able to snatch them out of My Father's hand. I and My Father are one. John 10:27-30Also, just turn to the first chapter of Joshua. There, you will see in verse 5, No man shall be able to stand before you all the days of your life; as i was with Moses, so shall I be with you. I will not leave you or forsake you. Verse six goes on to say, Be strong and of good courage. Verse 9 says, Have I not commanded you? Be strong and of good courage; do not be afraid, nor be dismayed, for the Lord your God is with you wherever you go. And the last verse of the chapter says, Only be strong and of good courage. Now, please keep in mind that those passages from John 1 are not the complete verses. However I omitted them to show you something. God commands us to not fear. He obviously loves His children otherwise He wouldn't have died for us. Rest in His peace. He says, Be still and know that I am God;; I will be exalted among the nations, I will be exalted on the earth! Psalm 46:10. Hold tight to Him and He will never let you go. Give him your worries and your anxieties. He'll take care of you. Matthew 10:29-31 says Are not two sparrow sold for a copper coin? And not one of them falls to the ground apart from your Father's will. But the very hair of your head are all numbered. Do not fear, therefore; you are of more value then many sparrows.

Sounds to me that you need to first try find things you like doing,or at least once did and keep busy for a while and see if this helps in some way.Also suround yourself with good people,friends, family who lift you up and support you.
As others have said,God loves you,he loves all of us no matter what.
It of cause dosent mean like any parent, likes what we always do though,so some times when people make remarks like he doesn't care,why should we care about him or God is unfair,it may be because things dont go their way or they can't see what God is all about perhaps.
Just to comment on that while i am here...
God can't fix every thing in this world as he has given us free agency,and man is the one who make destruction,not God and as at times may seem things in this life is unfair,and even the stronges person goes through things in life that are very difficult,we dont have answers to everything.
Some times for example take when you have very bad health,it's what we do to make our health bad at times and some times ,it's not!,but simply just lifes trials.We are not going to be here on earth in this state forever and we need to make the most of what we have.
I say to you here do the best you can and have faith in him and you will one day rejoice in doing so.
Take care,but do seek help from a professional if need be.

'may be because things dont go their way or they can't see what God is all about perhaps' no, that's not it anonymous.

God is an unfair and merciless person, I wouldn't care about what he thinks.

I don't know where people get the idea that they have the right to speak on God's behalf. If you're getting beef from this God person then maybe you should talk it through with them (like, in prayer, or something) and think about what you can do to improve your relationship. Maybe you could get involved with your community or help someone out. The essence of sin is doing stuff that's going to screw you over in the long run, so if you mess up don't dwell on it too much; move forwards and be better.