So I Figured it out!
Upon searching every bit of the process of Steemit, I knew that everything is just my misunderstandings about 15 Steem Power that I'm talking about which is not lost, It's just a free rental for the new users of steemit.
to be honest I just went full panic and didn't calm myself. I discovered that when we bought an amount of Steem Power, it will be deducted to the current free rental Steem Power of steem it which is 15 SP. So because of my busy psychedelic brain I totally lost myself and sent emotionally to the situation.
Keep Calm and Socialize.
After I got back my 4 SP for delegation which I normally don't know how to use it, I thought it removes all my rental 15 SP, I didn't notice it's because of the 12 SP I bought before that deducts my 15 SP free rental from Steemit. I admit I didn't read things about this, so now I felt comfortable to the process.
So what I do is to buy more SP to retain the steem power I need to enjoy the platform in the long run. I really felt thankful to the people who help me specially 
what I learned here is 15 Steem Power to all new user accounts of Steemit is only just a rental Steem Power not totally yours.
I do hope I shared a valued lesson to all my "Newbie" colleagues of steem it about this and inspired you all to continuing to support Steemit and the community to grow even longer as the new future of social media. help and guide us to earn more BTC, LTC, DGB as the next cryptocurrency of the next generation.