I think you sound like a sensitive soul, and that’s nothing to be ashamed of! I can relate to a lot of what you’ve said, and although this level of sensitivity can be burdensome at times, it also carries its own strengths, and I would encourage you to play to them. You’re also not alone - Google “highly sensitive person”, there’s been a lot of research and writing in this area.
However, it also seems you’re quite anxious, hence why you can’t enjoy the moment. I know this will sound clichéd but practising mindfulness will really help, although it is difficult at first. I’d also possibly look into other forms of self-help or even therapy.