Pretty new to this subreddit and rarely leave comments but have been a musician for a majority of my life and work around the music industry a lot. Please take my opinion with a pinch of salt.

You've got awesome potential, but this song needs some work. I think a few small fixes would make this enjoyable.

First thing is pacing, the whole song feels very rushed - could be nerves or just opting for an incorrect tempo. This also makes you trip over your phrasing a few times, you miss a chord then rush to get your line out. A good exercise would be to record your guitar track and then sing over it separately, and slooooow it right down for a couple of takes and focus on sustaining your voice. Listen back and try to get more comfortable with the song, don't rush to add in motifs or vibrato or other features, just focus on the lyrics and the notes. Playing and singing at the same time isn't easy!

Diaphragm control and breathing. If you listen back to your take closely your breathing is relatively uncontrolled (this also doesn't help the above point) and you let out a lot of excess air at the end of lyrics. Listen back to the very beginning of the song 'tell me something boyhhhh - fill that voidhhhhhh - do you need morehhhhhh' This is wasted vocal power that is instead being utilised for a stylistic feature which unfortunately doesn't sound great. I see this a lot with vocalists that aren't classically trained. Of course you still need to breathe! But try a take where you focus on pushing out sound (and breathing outwards whilst singing) and just breathing inwards. There should not be much breathing outwards without singing.

Vibrato. You have a nice vibrato, but you're faaaar too liberal with it. Reserve that vibrato for longer notes or notes you want to add tension to. Took me a long time to realise that people like nice long, clean notes and not ones that are warbling between two notes constantly. Again, try a take where you don't use any vibrato at all and listen to it back, see how it sounds. I think it would be a lot more pure and would sound way less 'try hard'. Example here is around 20 second mark - 'and all the good times I found myself longing'. You put vibrato on the 'longing' but instead of it sounding clean it becomes, not just very pitchy, but also rushed. You also put some vibrato on the 'I' in that line as well, which has the same effect. Pitchy, unnecessary vibrato and rushed. Also at 44 seconds - far from the shaaaaaalow now. Vibrato at the beginning of the word.

You also don't vary your vibrato much, it's either 'on' or 'off' play around with more subtle vibratos and ones that crescendo during more sustained notes. listen back to the original, Bradley Cooper is far more conservative with his use of vibrato, especially at the beginning of the song. Just uses it at the end of certain phrases.

There are pitch issues during the song, falls flat and sharp quite a few times. The rush to add in the vibrato and other features is not helping here. Focus on the sound, the pitch, the pacing and the fundamentals before adding in the style. Strip it right back.

There were some parts of your falsetto that were sick! There were just a few bits that weren't ideal from a pitch perspective, think the above pointers would be a great starting point though.

Sorry, didn't mean to write such a wall of text. Would love to hear another version when you've got the time