Next time you're stressed: Take a step back, inhale and laugh. Remember who you are and why you're here. You're never given anything in this world that you can't handle. Be strong, be flexible, love yourself, and love others. Always remember, just keep moving forward.
There are so many things that you can do right now to make yourself better. From meditation, to spending time with family, to going and doing a hobby that you really enjoy, almost anything that you do actively besides mope around, will help to change how you are feeling in this moment.