How do I become more confident to speak up in class?

I think you should take things step by step. No one is expecting you to get into a big debate during discussions, you can just say what you like when you feel like it. Even if you just say one thing, it's a start in the right direction and then you can start to build up on that. Everyone has their own opinions so people might not necessarily agree with what you said or may not like it but that's fine. Discussion is all about different opinions coming together! Remember that. So try and set yourself a target when it comes to group discussions, so for the next time you're in a group discussion try to give your point even if it's just a couple of words. Even though it's not much, you know you've achieved what you planned and it's one step ahead then you can start planning two points, then three and so on. Everyone has to start somewhere so just take things at your own pace and you'll be fine but DO NOT rush yourself or else you won't be able to say anything at all. Remember step by step at your own pace.

Speaking in class is something a lot of us are afraid of, and what you need to remember is that you're not the only one feeling anxious about getting something wrong or having people judge you.

Try to easy your way into it, by starting of with something small like a comment on something. Soon you'll realize that the only one holding you back, is you. But take your time, slow and steady wins the race. And you're capable of over coming your fears and it will feel so good to do it.

Uhm, I guess you can wait to be sure you have something to say that you are passionate about, rather than losing track by looking for occasions to jump in saying something just for the act of speaking up.

And as others have said, small steps, work to it by starting from saying something in front of one classmate, then in front of two, then 3, building your level of comfort gradually.

I feel like I can really relate to you because I am a very smart student as well, However I suffer, because I am a victim of social anxiety. I am sorry I can't answer your question, but I would really like to talk to you, and possibly become friends,I feel like it would be good for both to talk to someone that really understand what we go through. Please get back to me Lots of love Which you the best