Kids are God gift. You will missed out the happiness. Trust me it is worth to go through the ordeal of having children. Indeed it's tough and worrying, but that's part of going through the cycle of life.

You may not be able to get the vasectomy surgery that you want. Ask your wife to get Implanon. Last for 5 years. If in between you two change mind in having kids, just remove the Implanon. If still don't want, just continue get a new Implanon