Hahaha.... Perhaps we would say I'm really spoiled but seems I'm even more hard working than one might think. Of course it seems I'm a bit spoiled because I still depends on parents which makes me stands more chance to accumulate more bitcoin as you have said almost all my money might be considered discretionary income yet I'm only on the advantage to grasp more bitcoin than folks my age as guys my age would rather want to live a more lavish lifestyle but I chose a different pattern which is to use my discretionary income as you called it to buy more bitcoin oin and hold.
It is important that you invest in yourself too and not just only accumulate bitcoin, after school is a different experience and to keep your accumulation process going for a longer time, you need a good source of income. Learning a skill wouldn't be a bad one. Being a student is a safe heaven to prepare yourself for life ahead, most parents rarely support their children for long when they are done with school, so start from now to create a balance between investing to expand your portfolio and investing into yourself, so you can have a good source of income after school and create more avenue to earn more and perhaps increase your aggressiveness in your bitcoin investment with the availability of a bigger discretionary income.
As a low income earner investing will not be very easy for you compare to investors who are high income earner but sometimes even some investors who don't earn much and always set out their discretionary tends to do more better than some high income earner so most time it is not about high or low income rather it how you set your discretionary. So, it will be nice if you set out your discretionary well or properly in such a way that it won't affect you ( your expenses) and if you carry out this well in the future or within the short interval of time you will see your level of progress and what motivates investors sometimes is the level of progress they have in their portfolio.
The greatest challenge encountered in accumulation journey is lack of consistency. The consistent person always wins no matter how slow he is. If a lower income earner is more dedicated and committed to his accumulation journey, he is more bound to be successful than an unserious high income earner. The high income earner may take a long break in his accumulation leaving his portfolio stagnant, while the other person consistently buys bitcoin with smaller amounts until his bitcoin portfolio becomes a lot bigger than the higher income earner's portfolio. Also if the low-income earner is better at managing his cashflow, he also has an advantage therein.
Finally nobody remains at the bottom forever, the low income earner might be opportune to earn higher as time goes on and the consistency he has developed in his early days becomes a good tool to follow up his investment more aggressively and achieve a better result in his accumulation journey.