Why should C.I. make you different? Young kids might tend to exaggerate any slight difference, but mature people don’t differentiate based on what procedure you had done. I know people with it and it hadn’t crossed my mind to view them as outcasts.
Does your less frum mean angry at Hashem? People do react like that when things don’t seem to be working out as desired. You have a full life ahead of you. Don’t despair. Many people lose friends. As Lev Arye Boy once said, you win some you lose some. As you try to win new friends use the interlude to enjoy your own company.
There are things to know when it comes to making or keeping friends. I don’t know all of it, but being comfortable with yourself makes others comfortable with you as well. As much as you want a friend don’t obcess over the fact that it is a friend. Don’t argue and be jealous of interactions with other people. Try not to hang onto your friend, as in needing them very very much and showing up before the first opportunity. Try to be giving. But most important is your confidence and countinence.
These aren’t easy. Some people have this instinctively and others have to learn it.