Any solutions?

problem's been going on for the past few years. it's annoying cause I can't have a vast social life, and I'm a reasonably attractive lady with lots going for me. friends obviously tolerate it, while holding their noses, and it hurts me because i know it's not something i'm doing. tried to google this problem, but couldn't conclude what it is.

symptoms:
-stool isn't ever completely evacuated as of late (keep using tissue paper, and the fecal matter never seems to end) and as a result, feel like I have to keep going to the bathroom, RIGHT after I just exited

-the reason I became concerned is all of a sudden, about four years ago, I noticed people would sniff around me for some reason. I thought.. It's not my Body Odor , I have perfume on, but maybe I'm paranoid. But even my close family started doing it around me saying 'What is that smell? it smells disgusting. Did someone pass gas?' all the while I had done nothing. And I began to feel a disgusting sweaty feeling around my anus, which would leave sweat marks on the seats where I sat. It would feel like I had a constant ring of sweat on my butt, which was worsened by the heat, or when I got nervous.

-One day I turned around to talk to someone and got a whiff of this smell. It was disgusting, and it smelled so putrid. It was horrifying,and this is why I hate going out. I get stares and embarrassing reactions like people sniffing the air etc.

I think it's coming from my anus because I only smell it when i turn around a little. please help. it's so irritating. i did not change my diet before this started, so i don't think it could be that. thanks