There are many different kinds of engineering that one can practice. The distinctions go deeper than the discipline that is studied in school. For example, where I work an engineer with a background in Mechanical Engineering may be qualified to be either a manufacturing engineer or a machine design engineer. The kinds of tasks these two jobs involve will be completely different.
A manufacturing engineer is often concerned with product yields and procedures. This kind of engineer may need to write work instructions and then train others to them. Sometimes there are issues of personnel management to be performed.
A machine design engineer will spend a lot of time with CAD software such as Pro-E or Solidworks. The fundamental task is to translate a set of requirements into a working machine. This may involve creating new parts, or simply looking up the required part in a catalog and ordering it. Everything has to fit together, involving tolerance stack-ups and perhaps considerations of differing material properties. Then the machine needs to actually do what is intended, which may require troubleshooting and design iteration.
There are many other kinds of thing engineers do as well. Some engineers program all day. Some engineers spend weeks or months in remote construction sites. What unites all these things is a capacity for and accumulated knowledge of an applied technical discipline. Otherwise the tasks are varied, and what one engineer does would drive another crazy.
If you are interested in being an engineer, it may be helpful to shadow a working engineer to see what their job is like. This may help you narrow down a discipline. Often people find that a certain subject simply has an attraction for them, but you need some exposure for this to occur. You need to pick a discipline in order to get started. It is not impossible to change later, but choosing well will make your life easier.
There are many potential satisfactions available to an engineer. I enjoy the technical problem solving, but there is also the complex management of tasks required to bring a project to fruition. Seeing everything finally fall into place is very satisfying. The chaos that leads up to that can be very frustrating, but this is normal. No plan ever goes as intended, so some flexibility is required. My work also creates jobs for other people. Knowing that I am part of something that provides livelihoods for others is a big motivator for me.