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I would usually say join a society, but if there aren't any at your uni that you would want to join, it might be a good idea to see if there are any other groups/clubs in your area. There will sometimes be sports clubs, or other activities etc that anyone can join so have a look!
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Have a look on social media as there are often groups that you can join on there. Facebook often has groups for different universities that you can join so this may be worth a look.
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Have a look and see if your uni has any campus jobs going as these are quite good ways of making friends and also getting some money at the same time! You meet so many people here who will be students too so this is a good way of meeting people.
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Try and keep making sure you are going into the kitchen. You don't want to feel anxious to go in your own kitchen and sometimes the best way of overcoming this is to just do it as much as you can. Try and make small bits of conversation while you are there too and then slowly build this up.