I broke up with someone today. Can you correct my English please?
"When I look back now, there is so many things that I regret. But I am and will never regret that I was honest with my feelings. I love the ocean because whenever I'm in the water, I feel like I'm wrapped by mother nature. And all my loneliness or negativeness are gone. I hope all my friends and people I know would be happy and never feel lonely."

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Change 'there is so many things' to 'there are so many things'.
Make the second sentence this instead: "But I don't now and won't ever regret that I was honest about my feelings."
This is more of a suggestion than a necessary fix, but you could change 'wrapped by mother nature' to 'surrounded by nature' or 'surrounded by mother nature'.
The next sentence should be "All of my loneliness and negativeness just disappears." or to keep with the theme of the ocean, you could go with this: "All of my loneliness and negativeness just washes away." or "All of my loneliness and negativeness just flows away from me."
The last sentence rephrased to be more natural and correct: "I hope that all of the people around me will be happy and never have to feel lonely."

修正された文「When I look back now, there are so many things that I regret. But I don't now and won't ever regret that I was honest about my feelings. I love the ocean because whenever I'm in the water, I feel like I'm surrounded by mother nature. All of my loneliness and negativeness just washes away. I hope that all of the people around me will be happy and never have to feel lonely.」となります。♡ ✧*。