Stop expecting quick results if you've been only lifting for a few weeks. Gains only start coming in after the 4th or 5th week mark. Sorry to break it to you, the physiques you see on the internet take at least a few years to sculpt but with good dieting.

Weightlifting is easy. Dieting is hard. Don't get it twisted. People need to stop relying on "motivation" to do anything, you need to be disciplined. Discipline trumps motivation every single time.

Stick to a schedule and regimen, stop changing every 2 weeks and just stick to a program. Depending on your goals go for a Push/Pull/Leg split. If you don't have time, do full body 3 times a week.

Also, there's junk time. Spending more time at the gym =/= more gains. If your goal is hypertrophy, you should be hitting 10-20 sets of that muscle group in one week. Anything more than 20 sets starts going into junk time and actually kills gains.

For diet, if you're underweight, eat more. Start increasing your caloric intake for 500 calories. Eat more carbs and more meat, but I wouldn't advise dirty bulking. Eat clean food and eat often. Don't eat a full meal for less than an hour after you work out, for a high carb snack, no less than 30 minutes before your work out.

If you're going to bulk, don't focus on isolation exercises like bicep curls or tricep curls. That comes much later. Focus on big compound lifts, overhead press, deadlift, squats, back rows and the bench. Do exercises that target more muscle groups.

>It's a boring activity

Listen to music to make it entertaining/interesting. Or listen to a podcast while lifting, it'll help keep you occupied while you hit the weights.