I got into a top university in my country. The thing is, I barely got in (I think I got pretty lucky), and I have way less experience in the field of my study then most people around me. It takes me more time to understand concepts then them.

My problem is, I am too fixated on these thoughts. When I have a lecture or a seminar, my mind can go blank or go "I'm too stupid, I won't understand, I can't do it, I'll have to go over the material again after it's over" and I start panicking, even if whatever I'm learning is not actually that hard. If the class is offline, it gets even worse because I get anxious in social situations. I find out that it's not that hard, however, when I go over the material again myself and when I'm not anxious. I waste so much time because of this, and feel really guilty and stupid afterwards. It seems to be an endless loop.

I'm so tired and I feel worthless. 

Never got diagnosed (with anxiety disorders) or anything like that, and I can't seek professional help because of financial reasons right now.

So I'm just wondering if any of you have dealt with a similar situation and if you can give me any advice on how I can deal with this.

Thank you.