There’s a difference between being excited to share something and explaining basic concepts. If you excitedly talk to a paleontologist about dinosaurs, they will most likely excitedly talk back.

“Mansplaining” is specifically when you are trying to tell someone else about their area of expertise and insisting you know better than them. For example, if you told a paleontology how to look after fossils.

A lot of it, like most human interactions, is about how you approach it and your tone of voice. I don’t know what your level of social skills are, but if you’re excited to talk about something then most people who are in that field of study would be excited to listen and talk back. Just be ready to learn and accept the possibility that they may know more than you