Playing the objective is fine, but if you get murdered all the time it becomes frustrating. Being an asset to your team should be fun also.
- Play defensively and slow, don’t be the first at the objectives. Keep close to your team/squad (let them be “human shields” by going first). Support/medic is good for this.
- Always be in cover (always), use the environment/buildings/etc for covering as many angles as possible when moving. Never stand still without cover.
- Learn to aim. Good aim can win a lot of gun-fights (read about mouse-settings in gaming in general).