@Anne1325, your space looks lovely! I LOVE your furniture! Anyway, as @Sarah977 has said, you are NOT being insensitive and this behaviour is NOT normal. In fact, they sound like they are incredibly rude if they are accepting beers from you then taking them to their room! It's unfortunate you are having this experience with only your second guests. I'm in a similar situation as you (shared home, shared kitchen, etc.) and I've had over 350 guests in my home now. Different guests expect different levels of interaction - some I will barely see at all, others I connect with and we will end up sharing meals or wine or even going out together. However, it is very unusual to have guests who actually resent me being there (this has only happened twice and in both instances the guests hadn't read the listing properly and thought they were booking a whole house to themselves for $50/night).
Rest assured that guests are not normally like this, but in this instance, stand your ground and reclaim your space - you SHOULD NOT feel like you can't relax in your own home or have to lock yourself in your bedroom. Remember, this is YOUR home and these people are guests in your home. And please review them honestly - it is important for other hosts to know who they are getting as we only have each for support. Just a suggestion: unless you can see they have left a review for you, wait until the last minute (day 13) to leave a review to try to avoid them leaving a retaliatory review. They may not leave a review for you at all (many people don't). If they leave you a negative review, you can leave a public response to their review.
Just a couple of other things I've learnt along the way:
Firstly, I no longer offer access to the stove and oven due to excessive use in the past, mostly by people from a certain nearby region. I literally couldn't get into my own kitchen to cook in the evening as they would spend hours in there and I ended up feeling resentful. Since I have restricted kitchen use to kettle, toaster and microwave, it has been much better - I tend now to get people who go out for dinner.
Secondly, I no longer allow access to the lounge (unless a guest is specifically invited) as it was literally the only room in the house that was still 'mine' (apart from my bedroom). They have access to every other room in the house, so I just want one area I can retreat to. Of course, some guests still seem to 'take over' and then I usually retreat to my bedroom but since I have created those boundaries, it is working much better for me. In your case, it sounds like your guests have their own living space anyway, so they shouldn't need to access your lounge. I would reclaim your lounge so you at least have that area to yourself.
Also, just to let you know, when replying to people in these threads, if you tag them with an @ symbol, they will be notified about your reply.
Happy hosting!