Yes you will become better. Take your time sewing the 1/4" seam allowance, cut carefully, use a dry iron and don't use thick machine quilting thread in your sewing machine. I made this mistake and couldn't figure out why all of my pattern was off until I mentioned to someone that the only thing I did differently was use the thick thread. Problem solved.....
I am also very critical of my work. Always trying to point out the flaws in my quilts. My husband say I make beautiful quilts and said I should enter contests. My sister says the same thing. My work has improved within the two years since I began. If I have a question about something, I ask or look on this site for the answer.
No quilter will discourage you or make you feel bad about your work. There's a lot to learn. Keep trying even if you make the same pattern over and over again using different color choices. I promise you it will become easier and you will then want to tackle another pattern. There are many many shortcuts to patterns that will blow your mind! I am learning some of them and want to test my hand at those too.
Keep a photo album of your quilts. It is a quick visual to seeing how your work has improved. Besides, once you start making a lot, you will want to keep track of whom you gave them too. I have a photo album and my grandkids want to look at it all the time. They even point out who got my quilts and they are sharp enough to spot theirs.
It's a process and you should enjoy it no matter how long it takes you. Over time, you will get a little faster and become more accurate. But most of all, love what your'e doing. I do and it makes every quilt I complete that more special.
I have 4 quilts in the making and they are all going to family. Post your pictures so we can see your progress.
Take care and enjoy quilting.