Can floaters appear in young people?

Hi doctor,

I am an 18-year-old and have been seeing floaters for a few years. They got worse over the years. Some are larger because they are closer to the retina, and some are smaller. When I tilt my head up, I see many black lines, but when I put my fingers in front of my eyes and move my head from side to side, it is like I see a complex network of veins in my field of vision. When I wake up in the middle of the night, if I go into a bright room and then back into the dark room, I see vague flashes or moving rings in my field of vision. I am susceptible to light too. If I look at something bright, then somewhere not as bright, sometimes halo will be formed around the object or person, but the shape of whatever it was will stay in my vision for a while. When I look up or to the side sharply, I see a small circle in each eye. I noticed it when I was jogging, and with every footstep of pressure, I would see it if I looked up a certain way. It is like the circle you see when you apply pressure to your eye. I do not know how to describe that one. Also, if I take a pair of glasses and move it up and down in front of my eyes, I see many small silver lines. I have astigmatism. I went to the eye doctor, who told me my vision was good. I even saw the little black lines while looking through the microscope. It gives me anxiety and makes me so depressed. I feel like I am going to get blind, and I am just getting so anxious. Even though my doctor said it would all be alright, do I have a higher chance of retinal detachment because of my young age? Please help.

Thanks.