Hey there,
After reading your post, I just want to let you know that it's perfectly okay to feel angry and feel the way you do right now - a lot of people are feeling the same thing, so you're definitely not alone. This isolation can make people feel a bit distressed and "boxed in", and sometimes being under the same roof as your family during this isolation can end up driving you mad; this is normal. This is okay. Just remember that while it may feel like forever, this isolation is only temporary. There will come a time when it will pass by, but for now we've got to do our bit and stay inside as much as possible.
From your post, I've gathered that you want to keep fit and want to engage in some physical activity to maintain some sort of routine throughout this temporary isolation. Maybe your parents may not be able to buy you exercise equipment, but you could try going outside for a run or doing some exercise outside (such as yoga) that doesn't require you to be in contact with people. Lots of people are still going out for runs and walks during this isolation which is allowed, as long as some distance is maintained whilst outside. There are also lots of YouTube videos with exercise routines to do in your own home, so they might be worth checking out.
Another thing to keep you occupied would be some form of meditation. Google "types of meditation" and discover what feels right for you. Meditation is not only a good way to relax your body, but it also is a good way to pass time and allow yourself to sort of "escape". If you practice meditation enough, you can sometimes get carried away and end up meditating for hours without realising it! Even check out YouTube videos that have people talk you through meditation.
Don't forget to also do things you enjoy! If exercise is something you enjoy but you find you can't do it as often, try doing other activities you enjoy, e.g. talking to friends online, watching movies, painting, etc. Maybe even pick up a new hobby while you're at it! Just remember that it's 100% okay to feel angry and frustrated during these times; in fact, being happy all the time would probably be a little concerning. Remember to look after yourself and those around you, and by being isolated you're doing your bit to help keep others safe.
