Worried I’ll be told it’s normal during the pandemic to be so anxious
They probably will try to reassure you by telling you that lots of people are struggling with anxiety at the moment — try to take it as an attempt at reassuring normalisation rather than dismissiveness.
and worried i won’t be able to get my feelings out or explain things.
It seems kind of awkward and alien at first, but writing things down is useful, whether you write them down just to get them to make sense inside your head, or to read yourself to jog your memory before the appointment, or to give to the doctor to request that they read it.
Something like, "I've been feeling for . My symptoms are . It's worst when , but gets better when . The reason I've come to see you about it now is . I'm wondering whether might help."
I’m scared to have it all on my record
It's extremely, extremely common to have problems with depression and anxiety; you won't be setting off any giant red flags. And if your problems were severe enough to set off giant red flags, it would be unwise to try to deal with problems that bad without any help. But I do understand your reluctance.
and that they’ll tell me off for lying because when asked last week I said everything was fine.
People do that; they're used to it. If you really have to, you can say something like, "I know I said everything was fine last week, but, well, you know." And they will know. It's totally usual to pretend to be okay. And totally usual for people to then have to admit they're not okay. (Also, pretty brave.)
Everything you've said makes total sense, but also, it's stuff that's manageable.