The speaker has just gone through a phase in his life where he just grew up--he's changed (for the better, for the worse, we don't know). But, he's definitely changed, and now, he comes back to his old life--friends and family from way before. Things are different, he realizes. These friends, these people, all remind him of how he used to be...and he hates it. He doesn't want to be reminded of his past, of who he used to be, so he just wants to stay in tonight and not associate with all of these things. He's gone through so much already and he's a new, better person. Why bother going out and submersing yourself in all things past.
The speaker has just gone through a phase in his life where he just grew up--he's changed (for the better, for the worse, we don't know). But, he's definitely changed, and now, he comes back to his old life--friends and family from way before. Things are different, he realizes. These friends, these people, all remind him of how he used to be...and he hates it. He doesn't want to be reminded of his past, of who he used to be, so he just wants to stay in tonight and not associate with all of these things. He's gone through so much already and he's a new, better person. Why bother going out and submersing yourself in all things past.