Questions on research

[Flux2]

Hi, during highschool, I was lucky enough to participate in an undergraduate research program, and I was wondering whether I should include this for research experience when applying to grad school. Cuz it is an undergraduate research but I just done it in my highschool year.
I didn't get anything published and did not build up a good relation w/ the PI but I did participated in a poster session.
Similarly, in college, I did research in a lab for 5months but wasnt able to get along w/ the PI and no publications and now working in a different lab.
Do these kinds of research count if I'm not able to receive a recommendation letter from the letter or get anything published?
How should I make these researches look "appealing"?

Thanks!!