Here is the perfect English translation of the lyrics you provided.
"I wish you were here with me in this very moment," I find myself wanting to share the same time with you. "I wonder what you're doing now? I'd hate it if things were a certain way," I worry and grow anxious. "If I could just see you one more time, I'd probably do anything." But you probably don't think anything of me, crying every day filled with regret.
Maybe this world is a wonderful place. But what threatens it, in the end, is love. A warped love, mutating in this world. A heavy, distorted love.
For the first time, I was devoured by "loneliness." Even though I used to mock it, saying, "Over something like that?"
I want you to be happy, and I don't want you to be hurt anymore, but I can't bring myself to feel that in a straightforward way. If I can't be the one to heal those wounds, if I can no longer even leave a scar, then I want you to stay alone forever, unhurt.
"People can't live life alone," a song like that is beautiful and lovely, but "I can do anything by myself," I need you to let me hear a song like that now. Unable to say "I love you" properly, for my age, I was the ultimate child.
Do we become adults to learn how to love someone properly? Or do you call someone an "adult" who knows how to love properly? They say hundreds of thousands of lives are lost in the world each day, but to me, right now, more than ever, the world couldn't matter less.
And yet, people still search for love. In sickness and in health.
I want you to be happy, and I don't want you to be hurt anymore, but I can't bring myself to feel that in a straightforward way. I wanted to continue watching over your smile from right by your side. I've been sent back to the beginning, and I'm still frozen, unable to move. I truly believed there was nothing you only realize once it's gone.