Feeling like you dont fit in a friends group as a teen

Its not like i never felt like this before. Dont get me wrong i am 17 year old trans man that lives in Poland so feeling like that shouldnt be new for me -.- But i noticed its the first time when it actually hit me and i feel like my best friend does not like me the way he used to :/ 

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i have bunch of friend in my class/school and i never had any issue to fit in but now its different? Cause like my best friend started smoking and they never used to before and i always tried to be out of that as much as its possible. Not a big fan since childhood and im openly say that. To be fair im not mad at all for my friend that he started smoking. Im mad at myself cause since i dont go with him to smoke on a break at school he found also some new friends that i dont know and i feel like im losing connection with him :/ I mean im probably overreacting cause we still text and laugh everyday, we talk and sit next to eachother all the time. But he started smoking and at first for the first few months it was obviously once per maybe 2 months max. Right now its past new year and shi so there were some occassion to party etc and he now smokes everyday. So he goes out with different people more often and i dont know maybe i got jealous?? I know he is not doing anything wrong thats why its so embarrassing to talk about it with him. Whenever i try to show how i care and remind that its just unhealthy he thinks i want to rule abt this whole situation when im really open to new options and talks. I dont drink and smoke by a choice and im good at being assertive so im not afraid ill get addicted or smth. I JUST SIMPLY CARE ABT HIM SM T_T people are changing and its fine i know he is not mad at me or smth but since im in a bad mentally state and my ed got worse now so im not in a humour to laugh and he started smoking and going out with different people i noticed the connection between us is weaker and im just so scared of losing him :(( 

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I also tried to get into the group of new people he met. All girls from my school and i recognise them and while one was really nice and open to meet and talk with me, the second acted like i wasnt there or maybe again im too dramatic?? idk i really have problems with understanding peoples reactions so maybe she is always like that and i misinterpretate her. I see them around at school and its cool ig but i know they will never ask me to go out with them to the library and thats what really makes me feel like im left out and i dont fit in. 

I have also a girlfriend and other friends but this one guy is my top best friendo i would not want to replace with anyone else :/ And i know he also cares about me and he knows about my mental struggles and its stressing him also for sure. Even if he is acting like its not. 

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overall even if i could care less about the cigs, Its just hard seeing your friend getting addicted. Like yk i dont want to lecture him or getting into argue over that cause at the end i can just go away whenever he smokes or just shut up and ignore it but cmon… Thats literally the same guy that has been with me at my worst. And since i alr have an experience with cigs addicted person (very close one) i see how much it affects on other people and how addictiion mixes with stress and people are no longer able to control their emotions. He also just wants that rebellious teen phase that activated in him some time ago. Its understandsble like obv we re teens? B)

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I hope its not the most boring thing you have ever read but maybe its a nice post to start discussion about feeling left out and about smoking in general? What do you think about it? Maybe we have similar stories and thoughts :D