Mary and PA are both absolutely right. We all fall short of the glory of God but he loves us anyway. And we all sometimes feel like we are not worth it and that God can't possibly love us. People just pretend that they don't
Jesus said "Come unto me all ye who labour and are heavy laden and I will give you rest." If you give your problems over to God, he will help you deal with them. I know that this is much easier said than done, though. You have to try to focus on the fact that we don't need to be perfect (or even very good) for God to love us. Paul tells us that "God showed his love for us in this, that while we were still sinners Christ died for us." John tells us that "We love because HE first loved us" and that "He loved us and sent his son as an atoning sacrifice for our sins" "He sent his one and only Son into the world that we might live through Him."
I think that , as Mary says, you need to try to love yourself a little bit more and forgive yourself. God has already forgiven you so you need to be a bit easier on yourself. There is a verse in Isaiah chapter 50 that says "HE gathers the lambs in his arms and carries them close to his heart, He gently leads those that have young." God knows how difficult it is to raise a family, how many stresses and strains there are on parents and children, but He cares for you all during this time. He gathers up your precious children, he waits for you and travels along at your speed.
It can be scary going to church when you feel bad about yourself or your life because it makes all your problems seem more immediate. It can be even scarier if you haven't been for a while. How will people react to you? How will God feel that you haven't been and now you're coming because times are tough? I've been down that path many times. But you know what, the problems seem closer because God is closer to you, he wants you to give them to him. He is waiting for you, remember "Draw near to God and he will draw near to you."
You don't need to worry about praying, either. Very often, I try to pray and feel like I fail. I think that everyone does. Or we feel that we don't pray enough or that our prayers don't say what they should but "We don't know what we ought to pray for, but the Spirit himself intercedes for us with groans that words cannot express." and Jesus is always interceding for us. Isn't that an amazing thing. No matter how far down we feel we are or how inarticulate our prayers, Jesus is interceding with the Father for us and the Spirit is making our prayers understood and relevant for us. "Do not be anxious about anything, but in everything by prayer and supplication, with thanksgiving, present your requests to God" If you try to be thankful for the positive things that you see around you, the sunshine, a child's smile, the food in your cupboards, the bad things will seem a wee bit less daunting. I know it's hard, though, when you have problems all around you. Just remember that "I can do all things through Christ who strengthens me." If you just ask for the strength/patience to cope, you will get it. God knows what you need before you ask for it.
I think that this has gone on far too long, sorry. God loves you, he knows what you need and he is waiting to give it to you. I will leave you with my favourite scripture, it has served me well in a life that has often been quite difficult (another story): Psalm 40 says:
I waited patiently for the LORD;
he turned to me and heard my cry.
He lifted me out of the slimy pit,
out of the mud and mire;
he set my feet on a rock
and gave me a firm place to stand.
He put a new song in my mouth,
a hymn of praise to our God.