What kind of workouts are you doing? If you're mainly focused on cardio, then make sure you're staying hydrated during your workout. Don't eat for at least one hour before an intense cardio workout and for recovery try drinking Gatorade or something similar to help replace the electrolytes you lose when you sweat.
For strength training workouts, if you are tired during your workout it's a sign that you're not eating and sleeping enough in general. After a lifting session, make sure to get enough protein and water to help your muscles repair themselves. Otherwise you're going to be really sore and tired.
The thing that helped me when I was getting really fatigued in my workouts was making sure I was getting enough water and sleep. I was also sometimes working the same muscle groups two days consecutively and for me that was too much, my body needed more time to recover. So I guess it could also be muscle fatigue that's getting you tired during your workouts.
Everyone is different though. I hope I've given you some good ideas that you can try out and see what works best for you.
I'm new to this also but I found that some mornings its really hard to keep going if I'm not keeping hydrated and granola bars after an intense workout are amazing. Lol
Other than that just try to gradually build up so you don't tire yourself out too much or injure a body part, and it'll make it so much easier next time too.
I always try and have a strong coffee half an hour before a workout. It wakes you up and gives you a good boost. It seems to work for me anyway.
Black market labs adrenalyn cuts. Pro fight supplements creatine. L- carnitine for my pre workout. And then muscle pharm recon with 4 oz chicken breast or salmon and wild rice for my post workout. If I'm in a rush and can not eat whole food I'll drink a isopure pro mass or zero carb.