Unfortunately there is not much to go on based on your description to provide any advice. So here is some general tips.
- Don’t let medals be an indicator of your performance - Getting “4 golds” is not accurate to determine your actual performance (regardless of the role). In fact, the only useful stat in the scoreboard screen is your death count (the less you die the more you are contributing to the match overall). Instead focus on more performance oriented stats such as your weapon accuracy.
- Use the replay tool - After every competitive match, try to take time to watch your replays (remember you can browse your replays while searching for the next match), try to carefully analyze each time when you die and how you were killed as this is often the key to improving your own personal performance in each match.
- Improve your computer and connection - Many players don’t properly work to configure their computer or internet connection and may suffer performance rates which can impact your gameplay. See my performance guide in the Technical Support forum for some key tips.