I'm 25 and just hosted 2 meetings for the first time ever, and they both sucked.
I would say don't worry about it. Most people start off rough at first. If you said you were 35 and have hosted hundreds of meetings, then I might worry, but being young and 0-2 is nothing to stress about.
My advice is to jack things from other people's meetings that you like. Pay extra attention to a meeting you're not running, and if you see something you like, take it and use it. Or try to sit in a couple of meetings you're not involved in and just observe how the meeting flows. You'll get more comfortable in time.
Not sure if this is possible, maybe you can try to ask somebody to help you out, where you control the powerpoint and they do most of the talking. And you can chime in here and there, and also handle the questions. Then as you do a few presentations, and get more comfortable, gradually increase the amount you talk until you're doing the whole thing. Or an alternative of this is to get a hype man, just get someone to do the intro and go over an outline, and close things up, while you still handle the meat of everything.
A couple of things I hate (but everybody is different so take this with a grain of salt) is icebreakers and people who ask for answers to obvious questions. People try to use icebreakers to go around the room and get everyone more comfortable, but I think they just make things more awkward, and if my day is already super busy I hate wasting 15 minutes of a meeting on something pointless. I have work to do!
And it's always awkward when you ask for an answer to what's essentially a rhetorical question and nobody responds. "Who in here wishes things were done more efficiently?" Then all you hear is crickets. Don't ask questions and wait for answers, because it gets awkward when there's silence. Instead of asking a question, give them the answer. "I know we all wish things could be done more efficiently so..." I've seen a lot of people ask for answers to obvious questions and then end up crashing and burning when nobody answers lol.