Depending on your budget I would look for some kind of convertible bed. At a minimum a daybed style frame and a few large cushions could make the bed appear more like a couch for the day time. I would look for creative way to build some shelving above the door area, right below the ceiling to have more storage, maybe somewhere to put the keyboard if not in use. Find some cool bedding and cushions to give style and color. And a few more posters, art or even hang items that are meaningful to you to add some character. More storage and organized storage is important to declutter your area. Add yes, college is but a brief moment in time (take it from a guy thats in my midlife now). You'll have a better place soon. but get some cool stuff to make it feel like home!

some options for your bed:

https://www.amazon.com/DHP-DZ61570-Daybed-Linen-Upholstered/dp/B07KWHFFG3/ref=sr_1_18?

https://www.amazon.com/Daybed-Upholstered-Drawers-Support-Frame/dp/B088W7N565/ref=sr\_1\_13?crid=35FG024PDCNBM&keywords=daybed%2Bcushions%2Bfor%2Btwin%2Bbed&qid=1650676681&sprefix=day%2Bbed%2Bcus%2Caps%2C138&sr=8-13&th=1

https://www.amazon.com/DHP-Twin-Over-Futon-Convertible-Couch-Ladder/dp/B00T2XF8AS/ref=sxin_14_pa_sp_search_thematic_sspa?cv_ct_cx=Boys%2BDaybed&keywords=Boys%2BDaybed&pd_rd_i=B00T2XF8B2&pd_rd_r=9ecc40e4-f1c7-47fd-8fc2-ad4bf498d8c6&pd_rd_w=6G7Vq&pd_rd_wg=0JwhP&pf_rd_p=937f515b-f21e-48f6-8cfd-8695fa84b7c5&pf_rd_r=CVF6KXQ881YYA64MK249&qid=1650676385&sr=1-3-a73d1c8c-2fd2-4f19-aa41-2df022bcb241-spons&spLa=ZW5jcnlwdGVkUXVhbGlmaWVyPUExMkxTMVQwVkNYU0gzJmVuY3J5cHRlZElkPUEwMTA3MzE3MlFTRUYxRjMxMU5XViZlbmNyeXB0ZWRBZElkPUEwMTUxODY5MlNTMFlGVkdOR1lHOSZ3aWRnZXROYW1lPXNwX3NlYXJjaF90aGVtYXRpYyZhY3Rpb249Y2xpY2tSZWRpcmVjdCZkb05vdExvZ0NsaWNrPXRydWU&th=1

some cushion ideas:

https://www.amazon.com/VERCART-Polyester-Upholstered-Headboard-Positioning/dp/B07H5GSQYW/ref=sr_1_2?crid=35FG024PDCNBM&keywords=daybed%2Bcushions%2Bfor%2Btwin%2Bbed&qid=1650676769&sprefix=day%2Bbed%2Bcus%2Caps%2C138&sr=8-2&th=1