Why alexa itself is taking care of the requests made in my skill

I suggest you to post your skill id so someone from amazon could take a look, but before that, how your skill is called? If you don't invoke your skill and alexa has built in response for your query, it will respond with built in query instead of yours. Things change only when you open your skill.

Let's say your skill is called 'crypto info' or smth. So to make alexa aware that you are asking info from your skill, you should invoke like this:

'alexa ask crypto info about bitcoin'

Another way would be of course to open the skills and then ask for info:

'alexa open crypto info'

alexa: 'how can I help you' <--- your skill response

'tell me about bitcoin'

This is the basic way how to invoke your skill.

You can read more about invoking the skill in the docs: here.