Your best option is to keep taking those honors classes, and graduate from high school here.
I have had several students like you in my GED classes. Every single one of them has told me that if they were not too old for the US high school (all of them were), they would never have chosen the GED route. Their advice would be for you to graduate from the US high school. The advantage for you is huge. You are getting the same classes here as the students you might eventually study with in college so your cultural adjustment to college in the US will be a lot easier. You have the opportunity to perfect your command of Academic English for free. Yes, you still might need to take the TOEFL, but you will be much readier for it, and your score will be a lot higher. You can participate in extracurricular activities if you want to, and chances are that you can make some long term friends.
Your second best option would be to return to Bangladesh and sit your final exams there. Then you could apply to college here using those exam scores. However, since that would mean you would be taking the exams in April 2019, there really is no advantage for you. You still would be better off staying here for your senior year, and getting the US diploma in May or June of 2019.
Some of your frustrations with school right now surely are due to adjustment to your new life here. In part of your mind, you are thinking that your old friends are really done with high school and going on to college while you have another year of school. That has to make you a bit sad and jealous. You are far from your friends and extended family and everything you used to know. The food here is strange. The weather is strange. Everything is strange. Some days you just want to stay in bed with the blankets over your head. Skype and facetime are not the same as being physically present. Been there, done that myself (how else would I know about the blanket thing?) except I was already out of college when I moved to a different country. If there are a lot of international arrivals at your high school, the guidance team should have good adjustment strategies to share with you. You also could make friends with the ESOL teachers even if you aren’t in any of their classes. They are pretty expert on cultural adjustment. If you like to read, pick up a copy of “The art of crossing cultures” by Craig Storti. He has the best strategies I know of for getting through this phase of your life.
Hang in there. It will get better.