I could be way off base, but it sounds like you're just projecting a lot of these feelings upon God. For instance, you say you know what you did wrong and you've been praying for years about it. To some degree that sounds like dwelling, and not allowing yourself to move past things. One can ask God for forgiveness, but I don't think it will help much unless the forgiveness can be accepted.

It's also almost like you have this expectation for God to make it all better for you. I don't think in most religions that God was ever supposed to be a being who stepped in and moved your mountains. Instead he gives the strength for you to move them yourself, and the love and support to keep going when things are tough. If you've just been praying to wake up one morning with all your dreams achieved, then I can understand why you'd feel frustrated and hurt. But perhaps God is here to help us through the journey, not hurt us until we've proved ourselves then magically take it all away?

Also, you say God hasn't 'given you a partner.' Although love can be found in unexpected places, it's up to us to search for it then decide if we even wish to accept it. If you put yourself out there, then I wouldn't get too disheartened by not having someone now. Many people go years between relationships, and through relationships they'd rather not have had before finding someone they feel is right for them. This is a normal process, and one even the most loving of people often goes through. I guess that's another reason people believe in God though - so they don't feel so alone while going through the other important parts of their lives. Personally, I also never felt I'd find love. But looking back on it, during those times I also had so much extra time and energy to focus on helping myself. In a way, it may have been a blessing in disguise. I guess it's all perspective.

Anyways, again, sorry if I'm not exactly correct in all this. (Heh, not Christian.) I just don't want you to wait around for and feel rejected when it's not a necessity. I do understand it's normal to feel angry though, and God makes a great target for that. It just sounds like you may be more angry at how events in your life are turning out, and sometimes that's a blessings in disguise as it promotes change and acceptance. Just another way of viewing things.