Any help to as why i feel this way or what is causing it?

I feel almst like im dreaming. everything just feels fastworded in a way. I function normal but i just feel weird. Im 18 and i have had alot of things/ changed in my life but i dont suspect it to be schizophrenia or dementia or anything like that. I dont have trouble memorizing stuff. I just feel weird. Kind of spaced out. I guess i feel alot of anxiety and my heart races often and i often think i dont know what im doing when i really do. Its just a scary feeling, sorry about the terrible explanation. anyone, anything? thank you