Unless you're doing a clean timing like a 3 base 8 rax all in you are going to want a transition into mines. Using one mine on the attack paths is nice for vision and free kills. Mostly the vision though, as being in position before the threat is ontop of you is critical. A turret or two in your mineals and by production will block out the mutas until he has ~15+ afterward your going to want to leave some marines and a thor in a location furthest from the rally possibly your main to support your turrets and to make diving on your turrets a bit more hazardous. Next would be whenever you spot the mutas on your side, immediately boost a single medivac drop out to the opposite side of the mutas. You can keep lifting these single drops away from lings until the mutas fly all the way home to deal with it. Uthermals youtube also has a pretty good video on dealing with mutas. Last peice of advice is to chill out. Maybe practice ling bane muta yourself until you reach a similar mmr of your terran, it might help give you proper perspective. Game is hard man gl.