Do I sound selffish or is it just me?

So I've been anticipating this Paul McCartney Citi Field concert for about 3 weeks now.I've told my mom that I wanted to go and she said that she'd do her best or whatever.Well--As you can see,I have REALLY bad luck on my side.My step-dad ended up in the surgury room,cutting off his work pay for about 4 weeks now.My mom can't afford it cos she can barely make ends meet now..
So they told me today--I can't go.

I really wanted to,you have no idea what this concert would do to me.And she doesn't understand how much it does mean to me because she clearly says it's JUST a concert.To me,it's not JUST a concert.

So yea,I was a little pissed off today and she ended up getting mad,ranting around the house that she couldn't afford it or whatever.Apperently I made her feel bad,but that wasn't my intention.

I was sad that I couldn't go.I had the right to be,I built myself up so high that I had nothing at the bottom to save my ass from falling.So basically I crumbled.

Is it bad that I was like this,to make her feel like that?