Welcome to the forum and to a community that will listen and support you, to give you some comfort and to help you get some of your worries off your chest. I might start with saying though that I have never actually experienced a panic attack so for that I am very grateful but I want to say that from what I have heard they are terrifying so I am really sorry you are going through this now.
We are navigating through some unusual times with COVID-19 and the new information everyday and what we have to do, or infact not do, to get through this time. But we will, it is just a moment in time, it might be weeks and it might be months, which is hard, but we are all experiencing this so it is somewhat easier to see why and how it is effecting others as we too are doing it also. Life is kind of on pause for a moment and when it resumes as we knew it I really believe we are going to come out for it better people. Appreciation for our loved ones, for our jobs for our planet, I think it will be really wonderful to see the love everyone has been harboring poor out.
Uni is tough, Physics is a huge challenge so I congratulate you on being able to do that subject, I am sure it is that little more difficult when you are not feeling your best and you are having panic attacks as well as really doubting your worth. So many people your age are in the same boat as you and I am yet to understand fully why this happens at this age, is it the new learning at Uni? Is the the unknown for the future? Is it the expectations for you to have your life sorted? I am not sure but it sure seems to me that there is so much pressure. Can I say I am 45 years old and I still find new things that I want to do, that I learn about, that I want to explore. I think as long as we are here we learn and experience, so why the pressure on a young person to have it all sorted?
Have you considered a trip to your GP? maybe just to have a chat and to get some things off your chest and to see if there is some extra help or support needed for you at this time? It might really help.
It sure is tricky sharing a house with different people and personalities, sometimes it works and sometimes they are just not your crew, but that does not mean you are worthless or not valid, just means they are not your people. Is that something that could be considered, a change of living environment where you do feel wanted?
It has been great to chat to you CSmith1
Huge hugs to you