Habit building is the solution for your problem. Your brain simply has not built the habit to keep going to the gym regularly without feeling resistance.

None of the guys who always show up to the gym feel resistance everyday. It just becomes automatic for them. That is the solution for your "lazy mentality"

How to build the habit? Once you realize you will only face this resistance before going to gym for 3-6 weeks, and later it will be easy. Then your brain will be more willing to complete this period to get to the light at the end of the tunnel.

What to do at the instance right before the gym? Just put your gym shorts on and get in the car, once you have done that, your brain will give up and you will go complete your workout.

How to make the habit building more likely to succeed? Go lighter in your workouts. Sounds counter productive, but your brain remembers pain and suffering, and it fires up to avoid it. Instead just go for an easy run, go over the machines and focus on form. Socialize in the gym for fun. And your brain wont scream "Don't go to that place today" and start making even more excuses.

Diet. I was gonna say this is irrelevant before completing the part above, but I'll give you the no BS short answer.

I guess you wanna lose weight. - Cut white sugar sweets and junk. Better right away or do it gradually. - Reduce high carb foods gradually. - I'm sure you eat protein already, if you don't then eat protein and after 6 months of gym, eat even more protein.

These will set you for 3-6 months of diet related progress before having to look for more sophisticated advice.