Here we are in 2025. Take a second to think back at 2024 and all of its good and bad things, and make space for the good and bad things that are going to happen in 2025. Although it is sad to say goodbye to an old year and everything that happened in it, countless good things will happen next year, and unfortunately bad things too. Bad things are obviously sad, and maybe you spent 2024 without many bad things. Believe it or not, good things and bad things make up most of the best years of your life. Sometimes, bad things are benefits, partly when bad things happen to you and when they happen to others.
If you have an awesome year with only happy things (which is really rare), when something really good happens, you won't feel as joyful because you compare it to the other good things that happened in 2024, making the happy thing seem like something normal. On the other hand, if you've had a year with many ups and downs, when something great happens you will feel happier since you compare it to the bad things that happened in 2024, and you will probably feel more satisfied with whatever good thing happened.
Having something bad happen to someone else can be good for you too. Hopefully you will feel sad for them, but this can really make you reflect about your problems and maybe motivate you if your problems compared to someone else's problems are really not that bad. However, if you have a really bad problem or obstacle, worse than anybody else's, just think that you are making someone else cheer up, giving them a lifted spirit about their problems, this will probably lead them to solve their problems. Sometimes, this can motivate you to solve your problems (If possible. For example if you break you leg, you can't fix it, but you can wait patiently and happily).
In conclusion, don't worry about going into a new year and that maybe next year won't be as good as the previous, and don't worry about aging, losing friends, or any major changes in your life. Think about the positive things that will happen, instead of the negative things that potentially could happen.