The good thing about the Garmin is I can search for other people's runs and compare them to mine, so I also look at their heart rates and their around 150-160 so mine seems a bit high..
No point comparing your heart rates with anyone else given they may be fitter than you so their heart rates will be lower as standard....
If you feel your heart rate is high then it's high. The only way to sort that is run with less intensity or just keep running to get fitter.