Is it normal to wanna give them their space?

i don't interact as much with my friends compared to before. ever since my friend and another friend got together, there's this feeling of having to give my friends their space.

nowadays, i feel it childish and inappropriate to be how i was back then, rowdy, making turd jokes and stuff.

and whenever they are together, it's like a combo or something, i have to back-out just to give them their space when clearly they're open and all that and totally welcome me into their conversations like back then.

is it normal that it's just 'me' the 'third person'who feels awkward?