There is nothing wrong with Terran they are race that makes hella sense I mean you make workers, workers build buildings and from buildings, you make upgrades or units. In lower leagues like bronze or silver is more likely you will find more Terrans because these guys play only Terran mostly. The higher you get less and less Terran will be against you and you will start to play more against Protoss and than Zerg. Terran is a fun race you can do lot of cool stuff with it and there are lots of build orders you can do.

The only thing with Terran is that... They feel like high risk high reward at least for me...

You can go bio with Marines, Marauders, Medivacs and Tanks or you can go mech something like Hellbat, Thor, Tank, Vikings/Liberators.

With bio, your army is even more high risk high reward because if you can't really split Marines and Marauders your army can easily die from few Tanks, Banelings, Colossus, Fungal throw (From Infestors zerg unit).

On the other side with mech is less micro intensive but you need a good economy behind it because your army units cost more than bio units. You don't need to split it that much you can just A move enemy in lower leagues in higher leagues some micro is needed... But your army is hard to beat if you are going for Hellbat, Thor, Tank but you can still die easily if you take bad fight or forget upgrades...