Yes, this is an actual thing. When people often say "you're so sensitive" - perhaps you are. There is nothing wrong with being that way. It's said that those of us who are Highly Sensitive People (HSP) make up about 15% of us. So while others are experiencing normal stimuli to things, people like me who are HSP are often experiencing more than you can imagine.
Usually every sense is more acute. You can pick up things a little more when you hear them. Or you hear absolutely everything go on around you, rather than tuning things out to focus on one thing. This can be very overwhelming, and sometimes frustrating if you're in a restaurant trying to listen to what someone in front of you is saying, yet you also equally pick up the conversation at the table next to you, and the table on the other side, and the tables behind you and in front of you.
Your sight may be strong - even if you require glasses. You see colours more vibrantly, and have a better sense of your peripheral range than others. Because of this, you may experience more headaches - and even then, your headaches are worse than others' since you tend to feel things more.
Taste & Smell
These two are often linked together, and for a HSP they allow people to feel more pleasure when eating. A smell and taste can linger, and you can pick up things such as the smell of something faint where someone else may not smell anything at all.
There are those who love being touched and those who hate it. For the HSP, being touched is such a sensation, that we can go to the extremes of either way. Touch can be so sensitive at times that it can actually feel painful. I responded to a topic to someone recently about oral sex and why it is uncomfortable for some people, simply because they are too sensitive to endure it for any length of time. For a pleasure zone like a clitoris, the first few moments can feel fine, but quickly feel painful.
With sensitivity of course the nervous system is also affected. HSPs tend to feel much more, and show their feelings easily. They pick up on cues from people, notice even the slightest change in behaviour, and have 'a sense' something is happening more than most people do. Some people might guess that the boss at work is having a bad day because his/her door is shut. But the HSP will sense their boss is having a bad day before that door closes, by picking up on slight things that are unseen or unheard by most.
There is nothing wrong with being a Highly Sensitive Person. There are many advantages of being stimulated more than others. Those who are HSP usually identify danger before others do, they can get a sense of the people they deal with very quickly. They are creative, they are expressive, and they are often romantics. Do you think this describes you or someone you know?