Why can't I be myself around other people?

Because you don't appreciate/love yourself enough. You should ask "How much more can I be myself around people"

If you feel like you have to put on an act to be around other people, they're probably not people you want to be around. If you're insecure about yourself, perhaps that plays into feeling like you can't be yourself (not shaming you, I've dealt with similar issues!) If you find yourself to click with someone, being yourself is almost effortless :)

People adapt to their surroundings. In other words people will adjust to the similar attitudes around them. Most people are drawn to people with similar personalities but some will adjust to all kinds of personalities and fit in with most groups.

All of us have the tendency for conformism when around other people,it is a known psychological and sociological term.And sometimes it gets more intense in a way that you feel afraid to show what you are really like and maybe to be different from others.You might be experiencing social anxiety,try to look it up and find some ways of coping with it.

Sometimes people struggle to be themselves around other people because they arent confident with themselves entirely. You need to learn to love yourself more so you can express this!!!

Fear of being judged? Misread? Misunderstood? Disliked? there are so many reasons as to why you may not feel comfortable

As a matter of human behavior, people don’t usually prefer to be their own self around others. This is possibly because of many reasons. The first and foremost reason being the fear of getting judged. A lot of people are scared of being judged. It's not anything bad though. The fear of getting judged makes them a different person among crowd. The second reason is lack of self confidence. Often people think about what would others think if they will be themselves. Now, this might sound a same point as the first one but No! This is different. We can say that lack of self confidence results in fear of getting judged.