For context Im a 17 year old boy in year 12 doing A levels

So I've been noticing that I worry a lot for a few years now, and mostly during schooltime or around school, I've had a very noticable but background feeling of dread/worry about things. Whether its homework thats due tomorrow or something, even if I know that I can get the homework done, I still worry about it

Other times I'll be worrying about something at night, then wake up the next day and forget what I was worrying about but still tell myself that I have to worry about something even if I cant remember what it was

Some other times I worry about something for like a few seconds, then forget it, then start worrying about forgetting it

Ive never really had a panic attack I dont think, apart from one time when I had to speak in class and became kinda sweaty with breathlessness and voice breaks but thats only happened once and for a short period of time so....

So idk if this is a form of anxiety or if im just a nervous and forgetful person, but I was hoping you guys could point me in the right direction, whether thats to a medical diagnosis or something 

Any help is greatly appreciated