Coming back to add a thought to this: most people aren't born with the innate ability to identify their feelings, WHY they're feeling those things, or the ability to coherently convey those things. If you use "I feel like you hate me" statements, please don't feel bad.
Use those statements as a jumping off point. Explain to the person you're with that you're still learning how to be emotionally mature, and you know it's not productive to say things like "I feel like you hate me," but you want to be better. Ask them to help you stop and think about this if you need it.
SO! You feel like your partner hates you! And you've said it out loud! What next?
Think of a specific example. Did you feel this way because your partner went into the next room to play video games? Okay, okay, I see. What makes you feel like someone hates you if they leave the room? Is it that they are simply leaving your company? Is it that they left without saying anything? Is it that they're in a bad mood because of something ELSE, but the combination of grumpy-vibes and leaving the room triggered issues you have?
That's fair! That's fine! Say THAT to your partner next!! Tell them "hold on, let me figure out why it hurt my feelings for a second" and hold their hand and rub their fingers with your thumb while you sit there and think about it. Then say "even when I know you're in a bad mood because of something else, it still hits a sensitive spot in me when these behaviours combine" and explain that when they got mad at something else and left the room without saying a word, you got stuck in a spiral.
Relationships are give and take. Each partner HAS to learn and adapt to the other at least a little bit for things to be healthy.
For example - in similar situations to the one I've listed here - the bridge between my partner's brain and my brain manifested in the form of two questions: "Did I do or not do something that contributed?" Followed by "Can I do or not do something that will help?"
Maybe this wouldn't work for other people, but it works for us.
But the whole point of adapting your language (using "I feel" statements) is to improve your communication with others, and - just like any skill - it takes time to get properly good at it. If you're doing it badly, that's FINE. But try to improve. Have an honest heart to heart with your partner about it. Ask for help.
Sometimes a partner is willing but not able to help (like, if their issues overlap with your issues), that's okay. But ESTABLISHING such a thing is important. If you [BOTH] still want to make it work, you will have to seek help elsewhere.
If a partner is not willing to help - like if they aren't in a mental place to take on another person's struggles - or is expecting you to be perfect every second of every day, or if they're expecting you to do all of the adapting and they're not willing to help build a bridge between the two of you... Well. Make your best choices in that regard. It's perfectly healthy for two people who would otherwise be great partners together to say "I quite literally can't emotionally handle this at this point in my life." I've KNOWN people who dated, established that they can't support each other emotionally, broke up, and then got back together later when they were both single (and the couple I'm still in contact with has been re-dating for three years now!!!!!!)
Anyway. The point of this novel is just to say: it's okay to be bad at communicating. Work at being a better communicator. You can do it. It just takes time.