Times get hard, and we've been through them; some more than others. Maybe you're between jobs and struggling to pay your bills, stuck in a place far from your friends and family, or you're having doubts about the relationship you're in. The stress that comes with these problems can seem insurmountable, yet we find ourselves getting through them.
I'll quote Jeff Goldblum here in saying "Life, uh... finds a way." However, I've found that said quote isn't finished.
It should go, "Life, uh... finds a way to continue to screw you over."
There will always be a problem, some more pressing than others. It's okay to feel overwhelmed, but don't let your problems become who you are. You have a support system in your friends, your family, and your faith. They will help you in whatever way they can, they will be there when you need them most. Do not hesitate to reach out to them.
Don't be afraid to talk to someone about your problems. I have a bad habit of bottling up all the things that bother me, and when that bottle cracks, I blow up. It's not pretty. If you talk to your friends and family, you'll avoid stressing yourself out more than you already are, and for all you know, they have been in a similar situation as you and can offer you sound advice. I've been learning to do this, and my stress level has lowered significantly (even if I don't listen to the advice they give).
These problems are here for a reason; they challenge and season you for the years to come. The biggest problem in your life may be happening right now, but that makes it so when you have another big problem a few years down the road, you can look back at this time in your life and know that you've already gotten through your darkest hour. Your hard work now will lead to easier times ahead. Don't give up, you'll just make things harder on yourself.
For relationships, it's okay if things don't work out. If you're not happy, if you two argue too much, if the distance is too much; there are plenty of factors that are specific to your relationship. There is someone out there for everyone, and you'll know when you've found your person. But if you are both willing to work at your relationship, talk things out, and move on together, stronger, then relax. Things will be okay. Your happiness is paramount.
Have a plan to solve your problem. Anticipate all outcomes, be prepared to deal with it. Find peace, whether it be in music, friends, or being alone, and sort yourself out. Take a deep breath, you'll get through this.