Hang in there. Don't worry, most of us have had the same feelings, you are not alone. We just have to keep working, trusting, and doing what we can.

It isn't as bad as you sometimes think it is. It all works out. Don't worry. I say that to myself every morning. It will all work out. If you do your best, it will all work out. Put your trust in God and move forward with faith and confidence in the future. The Lord will not forsake us. He will not forsake us, . . . If we will put our trust in Him, if we will pray to Him, if we will live worthy of His blessings, He will hear our prayers.
(Gordon B. Hinckley, Ensign, Feb 2006)

[The fact is] most putts don't drop. Most beef is tough. Most children grow up to be just people. Most successful marriages require a high degree of mutual toleration. Most jobs are more often dull than otherwise.
Life is like an old-time rail journey - delays, sidetracks, smoke, dust, cinders and jolts, interspersed only occasionally by beautiful vistas and thrilling bursts of speed.
The trick is to thank the Lord for letting you have the ride
(Gordon B. Hinckley, Quoting Jenkins Lloyd Jones, A Conversation with Single Adults, March 1997)

Despair not, but if you despair, work on in your despair.
(Robert Louis Stevenson)

I speak to those who are facing personal trials and family struggles, those who endure conflicts fought in the lonely foxholes of the heart, those trying to hold back floodwaters of despair that sometimes wash over us like a tsunami of the soul. I wish to speak particularly to you who feel your lives are broken, seemingly beyond repair.
To all such I offer the surest and sweetest remedy that I know. It is found in the clarion call the Savior of the world Himself gave. He said it in the beginning of His ministry, and He said it in the end. He said it to believers, and He said it to those who were not so sure. He said to everyone, whatever their personal problems might be:
“Come unto me, all ye that labour and are heavy laden, and I will give you rest.
“Take my yoke upon you, and learn of me; for I am meek and lowly in heart: and ye shall find rest unto your souls” (Matt. 11:28–29).
In this promise, that introductory phrase, “come unto me,” is crucial. It is the key to the peace and rest we seek….
He is saying to us, “Trust me, learn of me, do what I do. Then, when you walk where I am going,” He says, “we can talk about where you are going, and the problems you face and the troubles you have. If you will follow me, I will lead you out of darkness,” He promises. “I will give you answers to your prayers. I will give you rest to your souls.”…
(Jeffrey R Holland, CR, April 2006)