I've been going through the same thing over the past few years. For me, I have had to learn to surrender my will to God's will. That is certainly not easy to do. Sometimes God's will is not what we want, but if we know for sure something is God's will then we need to follow Him and do it. We sometimes say "Use me as you see fit" and/or "Your will be done in my life Lord" and then get upset or disappointed if things don't go as we want them to or think they should. We can't expect life to be great just because we say "God, use me as you see fit". The way He sees fit to use us may not be something that we like. He may want us to do something that we don't even want to do.
Sometimes we have to go through times that we may not like, but for whatever reason it's God's will for us. I know I went through a few years of what seemed like a bunch of nothing, where I prayed for God's will, but didn't see anything happening. I prayed, asking God to enable me to get a job, yet I did not get any jobs I applied for no matter how hard I tried. I tried college and that did not work out. So, I was just stuck living at home at an age I should be out on my own, trying to figure out what to do. I didn't like it at all and at times I became frustrated, annoyed, and upset.
But, I always kept trying to do what I wanted to do and what others like my parents told me to do. I would ask God to show me what He wants me to do with my life, yet I would always rush off to do what I wanted. I realize now that I had to go through that time for me to get to the place where I would fully surrender to God's will.
It was during that time that I came to seek Him more, read His word daily, pray more, and have quiet time to listen for His answers. I was able to focus on God and not have other things taking up my time. I was able to discover His will, or at least I believe I may have. It has been a time of learning and growing spiritually. I've sat under the teachings of this ministry I mentioned in response to your other post, and from that have learned a lot. So, even though I disliked it and at times hated it, I can see now that it has been good for me.
I also realized that if we're going to surrender to God's will, then we have to fully surrender. We can't go to Him in prayer and say we surrender, then be like, "Yea, buuuut..." or "Uh...not that!" if we don't like what His will is or what He may be bringing us through. We have to fully surrender by doing His will and submitting to whatever He's bringing us through. We also have to wait on God's timing. His timing is not ours and things don't happen when we think they should. We may pray for Him to show us His will and then it may be a while before He reveals that to us or before it happens. Also, it doesn't always happen the way we think it should. In fact, I've come to see that it's almost always a different way then what I thought it would be.
Just focus on God and keep praying for Him to show you what He wants you to do. Then get quiet and listen. Be willing to do whatever He asks you to do. Surrender all to Him...surrender your will, your desires, your ideas of what it means to be happy, etc. and ask God to show you His will for you. Spend time with God in praying, reading His Word, and worshipping Him. Use this time to build a close and strong relationship with God. That's something that's really important. And, if you're really experiencing unhappiness in certain aspects of your life, then maybe you need to surrender those things to God. It may be areas where you need to change...maybe changing the way you think about something, changing the things that you view as important, or maybe changing attitudes (for me it was all of these things). There may be things that God is wanting you to let go of...ways of thinking, material possessions, etc. Just start asking God what those things are and when He reveals them to you, ask for His help in doing it. It's not easy, but when we ask for God's help then He will enable us to do it.
I've realized that we have to get to the place where our desires match up with His desires and we begin to take on His charactoristics. It takes a lot of prayer, submission, and it's not easy. But, with His help we can do it.
That's just my thoughts and what I've come to learn as I've gone through the same things. Hope it helps in some way. I will keep you in my prayers and if you need to talk, just PM me at any time.