I can only play demo mode on minecraft pc?

I was playing mine craft this morning and i went to log back in later that day and it was logged in and everything but it said play demo and i don't know what to do.

Added (1). It also says Welcome, player. In the bottom left instead of Welcome "my username"

Is this good for a gaming PC? - 1

Hey so i'm thinking of building a gaming PC that can record games for youtube such as minecraft and battlefield.
I have made a list of parts and as I'm kind of a n00b at this stuff I'm wondering if this is good.
Also will it last me maybe 2 or 3 years as well as will it be able to withstand a second monitor.

http://uk.pcpartpicker.com/p/KRgvqs

I can't really go any higher on my budget but leave your suggestions and I will see what I can do.

Was this person being rude to us?

Me and my friend were at the mall we're both teen guys. We went into this store and they sell makeup this lady stopped my friend and said
Lady: Hey (female pronoun) would you like to try a sample of (makeup brand) I think it would look lovely on you
My friend: Um excuse me but I'm not a girl
She just looked mixed up why would she refer to my friend as a female if he's a boy? He was wearing a minecraft shirt and a beanie he has longish hair but not as long as some girls. This happens alot in this store we go to they always mistake him as a girl. He wanted a new beanie so he bought one and as we were checking out the cashier said this to him
Cashier: Over here (female pronoun)
No one else was in line my friend looked ticked off and just walked over
Cashier: Did you find everything you needed today (female pronoun)?
My friend: I'm not a girl and if anybody else in your store refers to me as one I'm never coming back here I'm a guy not a female
The cashier then had an attitude with my friend. Were those people being rude to him?

BQ: What should he have done?

Go check out my videos on YouTube?

Any of you that have started a youtube channel know that growing is very hard to do. I'm not asking you to subscribe but will you guys go check out my videos and tell me what you think? I upload minecraft and call of duty and I need some feedback on some other series to do. Thank you for taking the time to read this and I also reply to every comment that anyone leaves on my videos.
YouTube- 360gamers78

Minecraft potion of strength?

The description on the wiki page is confusing it says that potions of strength increase melee damage by 130%. Will a sword that does 10 damage normally do 23 or 13 with a strength potion? I find it hard to believe that it increases by 130% or 260% with a level two. So is it BY 130% or TO 130%