In reading my post above, I think I am using the wrong term in ‘pitch’, I think I mean range. I will start off in one range and then run out of the range of notes that I can sing and have to alter the range or octave to sing the ‘missing’ notes 
Ok, that’s a little different then. The range of your voice can also be altered/increased, but it has limits of course. Every voice has it sweet spots, though, and we all require finding them.
But probably with learning more about proper singing technique, you will see your comfortable range increase. Lots of people (myself included) need to get familiar with their head register, for instance (aiming for higher notes) and need proper training to sing there at ease and with “more strength”. The good thing is that it is something we all can learn. 
But in some occasion it might be required to change the key of a tune to fit your vocal range better. It may be worth experimenting with the capo a little before you strain your voice too much.
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Thanks Lisa. I am now doing daily voice exercises and slowly tyring to increase my range. I am going to see if moving the key will work as well, but I have to be careful as I still need to be in my friends range as well as we will both be singing. Who knew that singing is so complicated 
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