I've changed?..

Anxiety.. i didn't think it was affecting me that much. It only ever happens when im alone. It seems not though, i've been told i've changed abit.. My friends say it has as i sometimes do let it get to me when im out with them.. was going really well with some girl but she said im not the same.. i've gone from really confident in myself and what i could do to doubting myself alot more. Looking back there right too. Im upset by this too... i used to be pretty together. Now i dont cope well at all. Feel awful. Im running out of ideas.