“being single is not a good situation to be in”
If that is the situation that you are in, then not only is it a good situation to be in, but it is the BEST situation to be in! I am not negating hishtadlus, just your apparent belief that everything that He does for you is not the best thing for you.
“because why not use everything Hashem gave you to serve Hashem? “
Precisely the point, you said that beautifully! You should be using everything He gave you to serve Him. And if he didn’t give you a husband yet, you still need to be serving Him with everything you do have.