He normally would have enjoy it more except Ash felt a little sad watching Misty and Brock hold hands. Ash felt left out now that his two best friends were dating.
This was what you wrote
Ash tried to smile, but his heart wasn't in it. A sense of loneliness settled in the pit of his stomach like a stone as he watched his two best friends, holding hands and laughing without a care in the world, walk ahead of him, oblivious to the sudden change in his demeanor. He wondered how long they had been together, and how much they had even thought of him. Bitterly, he also wondered if there wasn't something he could have done to prevent becoming so alienated from them.
And this is what Feliciano wrote to show you how it should've been. You see what she did, she described what he was feeling right down to the bone without actually saying the word feeling why? because a chapter isn't supposed to be a quick read it's supposed to be something that people can get into and that's hard when there are only a few lines.
I don't expect you to get better from dusk till dawn god knows I didn't since I grew slowly but if I was able to do it with english being my second language then anyone can. My advise read stories and actually pay attention to them I don't mean to base yourself on what some stories did just read them and note down.
Also when you're describing feelings it isn't as easy as saying felt for example when you dip into the water what do you feel "you feel wet?" no aside from that a person's body tends to get cold due to the feeling of the water against the skin your hair hits your forehead and you can also feel the waves of water coursing along you legs because they're under the water. This is what describing feelings is it's to describe it in clear detail instead of words.