Raiyuu,
Dare to believe that the Lord is right there with you – just as He promised He would be. Sometimes it gets very hard. Jesus knows that, and that's why He came. He knows we can't begin to do it on our own. So He invites us to let Him bear the burden:
Come to me, all who labor and are heavy laden, and I will give you rest. Take my yoke upon you, and learn from me, for I am gentle and lowly in heart, and you will find rest for your souls. For my yoke is easy, and my burden is light.” -Mt 11.28-30
Some trials there's a natural answer to. If so, we should find it and use it and end it. But many times something deeper is going on that we cannot directly control. In that case we must trust Him, and draw strength from His promise to work all things for good (Rom 8.28), and to perfect His power in our weakness (2Cor 12). We can also be encouraged by what it will look like when the trial passes:
But he knows the way that I take; when he has tried me, I shall come out as gold. -Job 23:10
1Peter is all about suffering for the Lord. It may help to go through it.
In this [the promises, and your inheritance] you rejoice, though now for a little while, if necessary, you have been grieved by various trials,
so that the tested genuineness of your faith—more precious than gold that perishes though it is tested by fire—may be found to result in praise and glory and honor at the revelation of Jesus Christ. -1Pet 1:6-7
And after you have suffered a little while, the God of all grace, who has called you to his eternal glory in Christ, will himself restore, confirm, strengthen, and establish you. -1Pet 5:10