Warsteeds are different from those of pleasure or transportation. Warsteeds have different abilities, and one is able to fight from horseback in certain areas (Rohan and above). Learning to ride one's warsteed takes some time.
There are three types of warsteed. If one type is uncomfortable to use, then try the others and see which one fits the playstyle. Below find information which may assist one.
( BELATED NOTE: Only VIP has instant access to all 3 types of Warsteed. Everyone else automatically receives the Medium Warsteed, and must purchase the other types. This I learned after posting this thread. My apologies for any confusion that may have caused.)
WARBANDS:
https://www.lotro.com/en/game/articles/developer-diary-warbands
MOUNTED COMBAT:
https://www.lotro.com/en/game/articles/developer-diary-mounted-combat
WARSTEEDS:
https://www.lotro.com/en/game/articles/developer-diary-war-steeds
MOUNTED COMBAT 2.0:
https://www.lotro.com/en/game/articles/mounted-combat-20-tale-problems-solutions