Countdown: 245 days til Mini-Marathon: This will get easier right?!?!?

So all in all things seem to be going well.  Some pounds lost (6), getting control of my eating (staying in my calories) and getting my walks in (at least 4 days a week).  The question I now have is when does this start to get a little easier.  I mean I know I am overweight (duh) and I know it will never be easy so to speak but when will I stop feeling like I am going to die within 20 minutes.  For Example:  Last night the entire family went out for a walk with my hubby leading the way.  I kind of like him leading the way because he is faster and it makes me work harder but he makes it look so easy.  He is never winded and I CAN NOT keep up no matter how hard I try.  It seems as we walk each trip he gets faster and I get slower and to make matters worse he tells me he is trying to walk slower so the family can keep up (it does not help that I am 5'5" and he almost 6 feet tall, I take two steps to his one) .  So there I was last night huffing, puffing, feeling like my heart was going to burst and getting steadily farther behind the family and I found myself getting MAD (so mad that at one point I ended up crying yes I know real mature and really cute too this 35 year old fat chick following behind a man with 5 kids all NOT crying while I was crying...must have been a sight).  I was FURIOUS that I could not keep up and I found myself blaming my husband at one point and getting mad at him.  Luckily, later in the walk "Rational Rachel" finally showed up and told me that it was not his fault that I am overweight and slow and then I started feeling bad that I was holding him back..ugh.  On the way home I ended up splitting off and taking a different path home and ended up getting my entire 3 miles in and was down to 19 minute miles.  After returning home still alive and no longer crying I realize I do see improvement.  I just hope and pray that soon I will be able to go out for a 3 mile walk and I won't be gasping for air, wondering if my heart will explode and praying my knees don't give out.  Lord give me strength!!

This will get easier right?!?!