I agree with IncubusRulesAll.
If I might add when he mentions the ships in the sea he is speaking about all the girls in his life. where his life is like the sea and didnt use the word world or ocean because a sea is more narrowed to a certain place, where his life is not open to every girl, just the ones around him. The crowd that hangs over might be his peers pressuring him to find that special one he longs for and "mutes" his real thoughts but the "ships"("girls" in my view) help him think about the special one and what his goal is and to, if i could say, "mute" his peers pressure.
I agree with IncubusRulesAll. If I might add when he mentions the ships in the sea he is speaking about all the girls in his life. where his life is like the sea and didnt use the word world or ocean because a sea is more narrowed to a certain place, where his life is not open to every girl, just the ones around him. The crowd that hangs over might be his peers pressuring him to find that special one he longs for and "mutes" his real thoughts but the "ships"("girls" in my view) help him think about the special one and what his goal is and to, if i could say, "mute" his peers pressure.