I believe you're dehydrated and your body is trying to tell you in many different ways.
There are other possibilities as well, but this is very fundamental!
Thirst, is not necessarily always a good indicator of the lack of water
in your body.
Dehydration might cause irregular or painful periods, weight gain, diminished detoxification, constipation, weakness, confusion, heart palpitations, dry skin, headaches, bad breath, smelly sweat (indirectly)
Chronic dehydration might cause kidney dysfunction, kidney stones,
liver issues, muscle damage, blood in your stools, serious skin problems,
toxicity build-up (water flushes out toxins), digestive issues and so on.
You must develop the habit and discipline to drink ample spring water, so that your body functions well.
Aim for at least 6 glasses of spring water to start, one hour away from meals and maybe record your intake until the habit is instilled well in you.
The small symptoms will develop into serious health issues later, which
you will regret not having done something about them much earlier.
Also try to optimize your diet, by eating fresh healthy foods and ditching the artificial, processed and sugar laden foods, as much as possible.
Being young is great, but what is not so great is the fact that many things are taken for granted when one is young, and one of them is health!
Hope you get started soon with your new hydration plans!