Doing a binding on any shape other than a square can be intimidating.
If you're trying to join the ends at a point, you're probably making it more difficult on yourself.
If you have any fabric left, try adding a piece to your binding so it will extend to a straight piece of quilt. You might have to pick out some of your starting binding.
Once you have the two ends, with some extra length to play with, take your last part of binding you sewed on and leave about 3", then fold it 45degrees onto the quilt and press it there. Then take a TINY line of Elmers School Glue and run it along the folded 45 degree edge. then place your beginning strip and lay it on top and press. This will stick them together until you can sew them. Then take the two ends that are glued together and unfold them so they lay flat. There should be a crease line from where you folded the 45 degree angle. Use that as a sewing line and stitch a seam. Test it by folding the binding in half again and seeing if you've done it right. After testing, then pull the glued seam apart to separate the glue and trim that seam allowance to 1/4" or so, and finger press the seam open. Then refold the binding, and finish sewing it on.
Don't get discouraged. Even veteran quilters mess it up once in a while! Once you get it - do a happy dance!