I feel sad

I have been with my friends in the same class for at least 6 years but we had to split apart because we had to choose different streams for class 11. I thought the classes were going to be hell for me since I had none of my friends. I chose humanities for class 11 which is usually considered as an unpopular and less scope stream. About 10 - 15 students were there. Humanities was new in my school and I found the subjects interesting and chose that. I really liked my class and all the teachers were amazing . The students in my class were really friendly and I got close to them. There was this talkative, friendly student who was an extrovert ( I really liked her as a classmate ) She was friendly , she made the class active. She cracked jokes . She talked with everyone . In simple words , classes were fun but we all were constantly worrying about the future . Everyone told us humanities had less scope , they compared us science and commerce students . By the end of the month we had a seminar and that person only spoke about the scope of commerce and science . That made students even more worried . Now everyone wants to change the stream . I mean they have point . We only less students . There must be reason why our class have less students . Taking humanities is like riding through a narrow road with some options meanwhile all other stream are going through big road with loads of option . We don't know if we would still like these subjects in the future . I mean I like the subjects but what if I end up not liking at the end . Then I cant change it . What if I end up getting a job I don't like . It's just been a month with my classmates and the talkative girl is leaving . Other 4 - 5 are planning to leave . I feel scared and worried . I said them I would still be continuing this stream . The classes won't be same anymore . It won't be fun anymore . I got attached to my classmates . I am worried about future . What if I end up being nothing ? What if I end up not liking it ? Would my choice at the end be correct . I feel like crying . I feel sick . Why are we supposed to make our own decision at 16 ? How will I know my future career at 16 ? Will I regret it ? :(