Why do I get so easily irritated and angry with people?

The only thing there that can cause some aggression is Lilith in Libra. People with Mars and/or Lilith in Libra are usually very pive aggressive meaning they will do things to make others mad and then play all innocent. They can be conniving if they feel they are being taken advantage of or their is an injustice going on(even though it can be imagined as they are very justice oriented). They tend to justify the things they do in their head. Like if they will hurt someone they have to justify why they are doing it even if the justification is kind of sketchy. Other than that you don't have anything that can be aggressive except your Venus in Scorpio which can make you possessive a little manipulative in order to keep people around you.