you actually held off the cannon rush pretty well.

I wouldnt have made a second barracks. you always want that factory. Especially if you made a refinery before barracks. you have lots of gas. Getting that siege tank out fast would keep you safe from anything if you have a wall at the front.

Also, you should have gotten a reaper instead of a marine. You had the gas. If you had gotten a reaper you could have killed the probe with it, then sent it across the map to do a counter attack. (and easily have gotten past those defensive cannons)

When I'm terran I'm always b-lining straight for a reaper then siege tank. Reaper for the scout and harass, siege tank for the defense. Once you have those two units, you can sprinkle in a couple marines, and then youre in a safe place.

As for the hidden expo. When you sent your marines across the map, you should have left one in his natural expansion. Then you can see what his timing is to take his 2nd base (and you shouldnt take your 2nd if you think theres a chance he might attack soon.. which he could have done if he didnt take an expansion).

The fact that he never took his natural way past the 4 minute mark should have tipped you off to something weird and warranted additional scouting to see what your opponent is doing.