Soundtest I really like you and every time you say something about drug use I have to bite my tongue since I don't want to be judgemental because a) friends don't do that to each other unless they have to and b) for a person who does indulge into drugs, you seem to have it under control, somewhat. But since you're asking for oppinions especially from 'straight edge' people (which I'm not, obviously, but I neither drink, nor smoke or do drugs, or have sexual relationships, for that matter) I might as well tell you what I think about that.
If you hang out with people with whom you do not feel you are communicating (be it their fault or yours), no amount of drugs is going to help things. So what to do about this comes down to your principles and ambition, really. If you're wanting to have friends with which you're going to be able to have a decent conversation, and share worthwhile experiences obviously you need to find people with whom the common thread is those needs, and not any sort of substance. They might have been that kind of people once (and you also) but you have to ask yourself if what's keeping you people together really is drugs. Because if it is you're just all dependent and trying to cope with that fact by leaning (not holding on to, but leaning) on the other dependent people you know just so you can feel less lonely about the situation. As far as I know it only gets worse from where you are currently.
If I was you I'd stop drugs (no, seriously that's my advice
) and I'd try to spend more time with the things I'm interested in. Obviously without drugs you're going to be less happy. But you're going to be more self-aware, ultimately free and it comes down to what you'd rather be in your life between the two because I find that they are usually somewhat mutually exclusive.
ps I'm not just talking out of my ass I spent most of my teenage years getting wasted with my 'drinking friends' until I realised that it hurt me so much to constantly do things for which I was ashamed of.