So since I was a kid, I was known by my kind of seeing in future and stuff, I was initiated in reiki at the age of 12, and I feel the presence of abnormal stuff, so I alwaays kind of saw and heard things. And well I've been doing yoga and while meditating after breathing to soham, I saw colors, and I tought its usual seeing of weird things. And first, From my legs I could see yellow color, it was coming towards my head in waves, and then it got greenish, and I was shocked so I moved my head up, and saw some blurry could have purple color. First I tought it was nothing, but then I googled the chakra colors, and it seems like I actually seen right lights. Could it be posible that I actually can see human aura?

Mediatating can do some strange things to people. Thinkof it like going into one of those special tanks with no stimualtion. The mind fights to amuse/entertain itself.
It also heightens the senses and makes normmal perceptions extrodinary.

So don't freak out. What you saw you proably would normally see, but the mind tends to put a lot of things in the junk folder if you know what I mean. The meditating just made the experience brighter and more noticeable to your mind.

Once I went really deep while meditating. It was like my body was alseep, but my mind was awake and I could feel people talking and moving around on the other side of the room. Like feel the vibrations of them moving chairs and closing books. The world slowed own completely and became sharp.

The yellow that you saw could be anything. Meditate again. Your mind knows what it is, you just have to find it.