Ok guys and girls....I need some help here! I have a 2000 csvt, with a little over 105k on it

Just the other day, I had this little prob start: every time I shift from 1st to 2nd (or to any other gear), right after i press the clutch it seemed the rpm's weren't going down (no, my foot wasn't on the gas!!) and sometimes they rev up on their own. it would rev up slightly, only about a 1/2 rpm while i had the clutch pedal pressed in. Then when I'd let off the clutch, it would take forever for the rpm's to wind down. It's not doing it all the time....so I'm wondering if it's the clutch slipping or not engaging....or if it's something else??? I asked my boyfriend and he said it doesn't sound like it would be the clutch, b/c i'm not hearing any strange noises or anything. I would appreciate anything anyone has to offer, b/c I'm not the best w/ cars!! lol Thanks