Learning the movement is very important, as I'm sure most of the other people here have alreay said. People who play like it's an old CoD game are easy targets. Learning how to slide hop/bunny hop and chain wallruns help a lot. You can do this in really any game mode, including custom games. If Titans are killing you a lot, learn to play around them. Either keep moving or stay out of sight as a Pilot. As a new player, you should learn to use at least 1 anti-titan weapon along with a primary gun. For example, I usually run the Alternator and MGL. When you are in a Titan, you should still be careful. Save your smoke for when a pilot is trying to climb on you (rodeo). When this happens, use your smoke and crouch to make it harder for them to get away. Also don't waste your dashes, especially when the enemy has a good Ronin. Staying at range against a Ronin swings the fght in your favor quickly since they either can't hit you or have to use up their dashes and phase. Another way to get better would be to watch the really good youtubers like Gamesager and Frothyomen.