Is It Normal to Fail to Exploit Anything on My Own LAN?

Hi everyone, I'm new here but I've lurked for around 2 months and read many tutorials. I was wondering if anyone could help me get past a wall in my learning: I can't hack my own LAN with metasploit.

At home I run Kali linux 2.0 on VMware on windows 7, Kali Nethunter on my phone and Kali on my RPi2. All other machines run windows 7, except one, seldom used, windows XP PC. Windows and most software are updated often on every machine.

Port/service exploitation on metasploit: I have used Nmap to learn what hosts are online etc. in my home via both console and armitage. I have tried various port-service exploits and the "hail mary" attack on armitage and had zero success. I haven't managed to find any obvious vulnerabilities in any recon scans on any of the laptops/computers in my home. Is it just that my network is hard to hack? Should I be able to hack these?

I know there are social engineering techniques like disguising meterpreter inside executables but I didn't want to rely on those as I'm trying to do this without leaving any trace.

Are there any port-service exploits that I could use to hack such a network without social engineering? Would I need to build a day zero exploit for this? Is this only a viable option for day zero exploit outbreaks and old operating systems and software?

I'm sorry to ask a broad question but I've tried to work around this metasploit brickwall for weeks and I'm losing steam.