Many people write to learn, don't be ashamed of that. If you find it helpful, keep it up, but realize that:
It's worth asking about documentation. Trying to write down, for example, every step in a technical process may be less useful than listening to the talk about the process, when you know the actual steps are written down in a how-to document. In that case, knowing where to find the documentation is many times more useful than having a written record.
Certainly you'll learn as you go and after a while you won't need all the detailed notes since you'll know the basic information. If many of your coworkers are deeply familiar with the system they work in, they may have forgotten what it's like to be new.
Be aware that some discussions are not set in stone. A conversation about how to design or approach a given problem may mean that nothing is all that certain - not every opportunity is a training session, and it may be less useful to take notes and more useful to simply listen, ask questions and offer thoughts when the final out come is uncertain.
One particular note is that sometimes eye contact is more important than perfect recall. Particularly in cases (in a Western office... anyway) where a boss or customer is giving instructions to a subordinate, it can be as important to show that you are actively engaged in listening by looking at the speaker. To slow down the conversation and clear up any confusion, reframe their statements, ask for clarification and take notes only when you know you have an action to take or a particularly crucial shared understanding to jot down. At times where you are trying to please a superior, very intense note taking can be perceived as a listener who is not actively engaged in the conversation. A good rule of thumb on this is to watch the body language of any speaker with more power than you have - if they seem jumpy or tense, they may feel they are not being listened to, and you may want to give more eye contact at the risk of less note-taking.
Probably the biggest transition from school to work is to realize that in many situations, you are expected to question, consider, and provide comment to the technical information being discussed. When you are very new, it is likely that your questions will outweigh your comments, but people at your work are likely to expect that to change over time. The mindset of wrote learning and relay that works well in many school settings may work poorly in an office that expects a lot of conversation and commentary... but don't worry too much over it, as you learn, you'll be able to provide mroe thoughts and less questions!