Once your friends know you well enough, they'll come to accept who you are. Those friends of mine who've known me long enough don't get angry at me because I never call - they know me by now. They don't necessarily understand just how difficult it is to pick up a phone and say hi, even to someone I've known for a over a decade, but they know that I'm still a friend, that I give a damn. Your friends will realise this too.