Is this rejection or am I just paranoid?

I always felt rejected, kind of out of place and even when I talk it bounces off. Im not a bad person and I get along with these people fine but when theres more then one of us it all starts. The worse is when I see people sharing advice and even when I try to chime in I am the one out of the bunch that appears to be useless and not taken seriously. I just don't get it. I now its not the people around me and they can be very good to me but theres some bug I just cant seem to work out. To be honest I never really felt like a part of anything or was invited in on anything but felt more like a floater. Sometimes I even feel like I am being pushed away and I have to work my way in. Sometimes I am stuck in my own world and maybe I am to late and Im not always with these people as much as I could be but I feel that my absence is not enough to cause this or is it? I have to admit I do get bored easily and when I do have people over sometimes I go off and do my own thing when they are occupied. Thats something I cannot help.