A lot of people grow up with dreams about what they want to do when they grow up; like a doctor, fireman, or police officer. It can be difficult to work towards a goal for so long, and if you don’t dedicate yourself to achieve your goal it can be difficult to achieve.
For the first step you need to make sure you meet the qualification requirements for your profession. If the competition is high, then just meeting the basic qualifications may not be enough. An example of this is the large percentage of people who apply to medical school will never get the position, and not necessarily because their academic record isn’t very good. in situations similar to this you can still find a pathway to your desired career by looking for supplementary qualifications which may be seen as a bonus (such as a degree in biochemistry for instance), or also by doing volunteer work in the environment you want to work in.