$1 you save first when it is enough to buy, then buy Bitcoin even though you will only get a decimal amount.
If you work and get paid, it's better to invest a percentage of your wages in Bitcoin and not in crypto.
Cheers. I wish you success with your wishes and plans. Don't force yourself but trying to be able is good.
The best thing is to set aside it in fiat form and then convert it to the desired coin, it seems that it is more effective. Remember every transaction has a fee, the minimum transaction so it seems difficult to get 1$ in fiat converted directly to crypto coins.
Even in 2015 I started trading no more than $50. But I agree with you, there is no need to force to invest in crypto. You don't have to force $1 every day if it makes it difficult for you to meet basic needs.