Being A 'sensitive'

First time poster here so apologies in advance if parts don't make sense!

I've always 'felt' spirits around me, just recently these 'feelings' I have, have gotten a lot stronger, I can literally feel 'someone' hovering over my shoulder, it's hard to explain and I don't know if anyone can relate to this but I'll give it my best shot!

Like I said before I've always felt spirits around me, not necessarily linked to me and it's never been anything strong, just like I can feel that there's a different energy in the air. Just recently I've been feeling energy around me that feels like at times it's attached to me, it doesn't feel like a bad energy, and I feel this regardless of whether I'm the only one in the house or not. In my mind I feel as if it's an actual figure standing behind me, it feels as if someone is standing right behind me and is giving off body heat but rather than being body heat it's energy, obviously there's never anyone there when I turn around but I know what I'm feeling isn't just my mind playing tricks on me, I don't know how but I just know, you know?

I have recently had a reading from a medium and she said that I am very sensitive, I was hoping maybe someone can give me an insight of what being sensitive actually means?

I always feel other peoples emotions, and by this I mean like energy, like negative energy, anxious energy etc and I'm wondering if I am sensitive, is this why I pick up on the 'emotions and feelings'.

I apologise if a lot of what I'm saying doesn't make sense but it's hard to explain without sounding silly!

I'd greatly appreciate any information anyone can give me on this subject.

Thanks!:)