To establish a 'healthy' social circle, you should befriend those who can accept you, who also tend to be good friends, instead of those who are labelled as 'inferior' to you by yourself, and you should not make usage of friendships as boosting your self-confidence or whatnot either. I know how it feels when you are feeling inferior to others when you are not a normal speaker, but firstly this is not a 'disadvantage', this is literally a 'disability', like, will you feel inferior if you are blind, deaf, amputated, etc.? Secondly for those who keep away themselves from you because of your stuttering, they just don't deserve your time and effort, which is a good thing to you because you avoid potiential humiliations from them. Thirdly it will not be a bad choice to boost your self-confidence from other regards, instead of solely that from speech fluency which is very likely to be limited for a lifetime because of this disability, making it pointless to make it as the source of self-confidence also. By this way I suggest you to find or establish your own hobbies and life projects, because life will be boring if you have none. Finally I suggest you to analyze the components of your stuttering, to judge if your stuttering is largely mental or neurological, because it determines whether you shoud place more emphasises on cognitive therapy or speech technique(the former means more empahsises on cognitive therapy and the latter means the opposite), and the more mental/neuruological your stuttering is, the more you should put emphasises on the corresponding countermeasure. Hope I can help you a lot! :)