On how to stay motivated

It's just hard sometimes.
Sometimes my only motivation is that I don't depend on nobody but myself. I I don't push myself hard enough then the only person who's going to suffer the consequences is me.
I happen to stay calm and somewhat positive on though times. But when things are not as bad, that's when I start giving up. Why? I don't know. I seems like I need to hit rock bottom in order to lift myself up and continue with the struggle. And I'm the strongest when I'm on my own.
Does this mean that I need to be doing really bad and have nobody around for moral support in order to find some motivation?
I have to find some balance, I definitely do. As much as I want to be on my own and as much as I seek to be in a desperate situation, the world (or whatever) seems to be sending people who actually want to be around me and also keeps improving my situation. So what is left for me to do? Just take life how it comes and go with the flow.
(I don't know if the text follows what the title says, but what the heck)