Reading academic papers can be tough for new people as the words in a good paper are normally written very well and compact to deliver what it means and differs from a normal literature and can take some time to get used to. It's a common problem for everyone, and don't worry about not getting the information in after you read the paper. The main purpose of reading the papers, contradictory to what you may believe, is actually not to understand the paper completely, it's so that you know the concept/idea exist. When you go through the lectures, hopefully what they say will ring a bell that you read it somewhere of which you went back to read them again is the time you should start understand them.
I'm not a sociable person myself and it actually only until almost the end of my second year in university that I started making friends, as long as you don't think you need a "friend" too "desperately", I think that shouldn't be a main concern as most university tends to have the infamous group projects that force you to work with others and will actually promote conversation with your classmates to find like-minded people.