According to your story, it means you are equally not financially stable since is your teacher that gifted you the smartphone you are using to connect to this forum, so with all these financial limitations you mentioned in this thread.
How do you intend to put up the money to invest in Bitcoin, because you stated you feed from your parents meaning you are dependent and you did not mention that you were either employed or operate a business?
According to the OP, he intends to invest in bitcoin through the agricultural work he will doing on people's land. That's to say, with the money paid to him for the agricultural work done, he will use it to invest in bitcoin regularly despite how the money comes in and how little the money is.
What am all confused about in the OP story, is how the teacher was able to introduce bitcoin to OP, knowing fully well that he can't invest in bitcoin as a student and he is also dependent on his parent for survival.
If the teacher truly wanted to assist the OP, he would have discussed bitcoin with the OP's parents rather than with the OP himself. In this way, we can say that the parents of the OP can request some sort of business plan that will enable them to make a small investment in bitcoin.
Nevertheless, it's still cool that the OP has a plan to invest in bitcoin through agricultural work and that he is willing to hold onto his bitcoin to achieve a long-term objective.