While venting occasionally is fine and normal, and it won’t cause any harm, doing it constantly will bring negative emotions only. So next time you think about venting about your problems to someone, try to think it through first and write it down. Journal it, keep a venting diary, or just write it as a message to yourself. And don’t just write things for the sake of it, and only describe why you are mad, also write how you can avoid it in the future.
Or, if you wish to eliminate this part completely, just focus on a possible solution. For example, suppose you are venting about a certain colleague to a friend of yours, and how they are making your life miserable. Instead of just talking badly about them, also focus on how you can avoid that colleague or not engage with them to protect your peace.