>>617969That might be a concentration problem. Try looking at a nice anime picture like pic. related, close your eyes, and recall it. Keep it in your mind as long as you can. When it escapes your attention, open your eyes, look again, close again, recall again, and so on, until you can keep it in your mind steadily. Find a new image and repeat.
I recommend working through this geometry book, it will make you smarter and you will have to work with images in your mind:
https://litter.catbox.moe/39em9n.djvu (/siberia/ won't let me post djvus…).