Saiber's answer was spot on.
Everyone gets stressed out but the key is how one reacts and controls the feeling. Stress is a natural biological defense mechanism embedded in our bodies and we can't get rid of it, just need to learn (with practice) how to control it. For me what has been working is to close my eyes, count to 5 or simply walk it off.
Bck to Saiber's advice, if you can't control it, seek out professional help.
All the best!
I'm a mental health counselor and I can tell you things like school/family/relationship/work can be stressful and it's part of life. But you need to always check in and see if that stress is so overwhelming that it is affecting your normal everyday functioning. When that happens- taking steps to identify the stressors that are causing the anxiety or overwhelming feeling, figuring out mechanisms that can help cope with it. Sometimes something as simple as a break or a nap can help. If you have trouble finding that coping skill- try reaching out to a Guidance Counselor or therapist to help you with it.