mMy lLife My Life

You need to use capitals in titles.

mMy lLife My Life

In titles, we capitalize the start of words, but it can be more complicated than that.

I don't know what thisI'm feeling now but I promise to never give up I promise. I don't know what I'm feeling now but I promise to never give up.

I'm not 100% sure of what you meant so you could also write (I don't know how to feel right now)

I don't know what this feel nowing is, but I'll never give up. I promise. I don't know what this feeling is, but I'll never give up. I promise.

I don’t know what this feel now but Iing is, but I promise to never give up I promise. I don’t know what this feeling is, but I promise to never give up.

Simple grammar, no huge problems. Reply if you need further explanation.