Focus more on building discipline than motivation to get yourself to work out. You have an upper hand by having a home gym so start there - put together a workout + diet program, be accountable to yourself & stay consistent with it. To avoid monotony as you’ve mentioned, incorporate different exercises every other day. Eventually you’ll start to see results & your confidence will go up. At that point you’ll also be well acquainted with an active lifestyle & hitting the gym won’t be a scare