You picked lovely fabrics for this baby quilt.
It sounds like your problem isn't that you don't know how to make a quilt, but that you don't trust your work and expect a lot of perfection.
Maybe set aside some time/materials to make a small string pieced quilt or "wonky star" quilt, something that doesn't require precise seams and matching, to learn to accept and maybe even enjoy imperfection?
Believe me, I am not a perfectionist when it comes to quilting, but I enjoy myself and the quilts I give as gifts have all been well-received.