I dont know whats wrong with me or if anything even is?

Im always real quick to snap. One second im fine enjoying life the next ill think about something or something will be out of place and it makes me mad. I dont become violent just irrerated. Its really hard to me to keep attention with anything. I could be talking to someone and loose my place in middle of conversation and then when its there turn to respond or talk i cant pay attention after a min. Or so. If someone is talking to me and its someone longwinded that you feel rude if you cut them off or try to speed up the converstation i start to become verry agervated and ancey almost to extence of just walking away. There are somethings that i can pay attention to . Like my job i repair tvs and could work on same one with no issue but conversations not at all. I dont know if something is wrong with me or if i have small attention span. The only thing that botherd me was the mood swings randomly and the agervation does anyone else feel this way and if so what are you doing to try to controll it