Salaam, habibty. I need to be honest with you. I had the same thing when I was about 11 years old. When I grew older, I was diagnosed with General Anxiety Disorder. Honey, perhaps you can go to a counselor to talk this out?
Salam Feeling or wanting death is not allowed in Islam But remembering death is recommended so we will always support us to make good preparation for it We must believe that all alive creatures will die If the time for it has come we could not delay it just for a minute.We came from Allah and we will come back to Allah again. You must always afraid to Allah and do not fear to others except Allah Afraid of something maybe shaytan so you must strengthen your faith by reciting the Qur'an,performing prayer and make dua for Allah's protection.
This usually happens to me when I continue do something wrong purposely. My friend felt the same way, but it was because she kind of lied to someone (taking revenge and stuff). There has to be something that's bothering you, no? May Allah (SWT) take away your distress on worries and shower you with blessings. Ameen. :) Sorry if I didn't help.
Take up a hobby such as bird watching , music or reading. Practice meditation daily to calm your mind.
