I'mma try to swim from something bigger than me
He’s trying to deal with something he clearly can’t handle through the only way he can think of—by avoiding it. This is probably the emotional baggage that is currently overflowing, to the point where he can no longer suppress his feelings with a ‘black suit’ facade.
However this could also be taken to mean that Frank is going for something that is bigger than him: He wants to make it big, and “swimming good” is to say that he’s giving it all he has.
Don’t miss the fact that he is an Ocean. Frank Ocean and an actual ocean would be bigger than him.
He says that he’s roaming around like he’s ready for a funeral ever since he lost his baby, so maybe he means that ever since he lost his baby, he wanted to commit suicide?
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