My parents are always arguing. And they're always grumpy. They seem to have forgotten about me altogether. How can I get them to stop.
It seems to me that your parents are in a difficult place in their relationship right now. The sad part is that it is affecting you.
We cannot change others, we can only change ourselves. Reach out to other family members, siblings, grandparents, etc., for support and encouragement. Find a Christian youth group which will provide you with positive interactions and experiences. The group will also support and pray with and for you and your family life.
Choose not to take on your parents' attitude. Become a light. Smile, use loving words, laugh and leave encouraging messages to both your parents. Shine into their struggles.
It may be difficult at first to become and remain positive in the face of grumpy-ness. Trust God to open up opportunities to communicate in encouraging ways. Look at it as a challenge, to put a smile on someone's face each day.
Eventually your parents will notice. You will change. And God will use you to make a grumpy situation, brighter.
Pray for an opportunity to in love tell your parents how their actions are affecting you and to suggest to your parents that you’re concerned about their relationship and would like it if they thought about getting some help.
Proverbs 15:13: "A merry heart maketh a cheerful countenance, but by sorrow of the heart the spirit is broken."