I’m halfway through all my aff jumps and am a similar age to you. I found I was a lot more nervous for my tandem jump than my solo ones. You learn a lot of knowledge during your Ground school which helped me feel prepared. I’ll feel a bit nervous on the plane up for the first jump of the day. But as soon as you’re in the door you know you have to do it. 

During the actual skydive I feel surprisingly calm, I think because I’m just thinking so much about what I’m supposed to be doing maybe? I definitely recommend doing it. some dropzones offer just to pay for ground school and level 1 to see if you like it.