Battling while riding in the huge Titan mech is a lot of fun and makes you a powerful adversary, but you're not impervious to attacks. If you take too much damage, the vehicle will explode and take you with it. Definitely pay attention to your remaining energy, and eject from the mech if it is about to explode. Now you just have to hope that no one on the opposing team shoots you down while you are makign your escape.