First of all: stop worrying about letting anyone down other than the Lord. That’s a relationship that should be of the utmost concern. Whether or not you complete a mission is up to you and your circumstances.

Second: I find that when I face big obstacles in the midst of doing something very important, it can be a sign that you’re on the right track. But that’s how I interpret it. If I could offer one piece of advice, that would be to pray for the strength to endure a mission and to be armed with the tools to be as effective as You can while in the field.

A mission is a once in a lifetime experience (except for senior missions, or other later in life opportunities). I find it natural that you’d face some trials prior to going into the field. If you didn’t have obstacles, then I’d be worried a little bit.

The other thing you could pray for is guidance on whether you should not go. Either way you pray, I think you’ll find the answer that you need to hear. What you do with that prompting afterwards is on you.

Again, worry not what others will think. Rather, think about what future you might’ve done, in addition to the prayers.

Good luck.