Similar to cocoon of the heart

http://www.mangago.zone/read-manga/cosmic_boy/ is really good if you haven't read it yet - highschool, angst, affected by the past


http://www.mangago.zone/read-manga/smells_like_green_spirit - I would say this has slot of realistic elements. Great manga!

thanks for reminding me of this webtoon which I forgot I read some time ago
Recs:
Bardo's Palace (only one chapter but there's suicide, abuse, etc.)
Cut (story of healing from PTSD)
Warehouse (you probably have read this)
Kamakiri
Silent Color (this one is the most similar to what you want)
G-Senjou no Neko

if you just want an obsessive seme, try my list:
http://www.mangago.zone/home/mangalist/583874/?filter=&page=1

waooo thank you so much

Thank you so much!!(≧∀≦) this is a lot and I love itヾ(❀╹◡╹)ﾉ~