I'm 18 and run... though just about every person I know who exercises will only train on the track/football pitch unless their coach forces them (I know one guy who got dropped off 10 miles from home by his coach and was forced to run back!) Locally I barely see any runners out, unless it's sunny of course... then everyone has a shot
I've done 100m, 5km and 10km so far this year- the 100m was a futile attempt to get points for the Northern League, it didn't end well. But my group at the moment is purely sprinters and middle distance based, whereas I'm looking towards longer distance/road racing.
I wouldn't be too worried about asking around, I had one woman jumping at me to help when I asked, which was nice since I'm rubbish And the best middle distance runner in my club (my age) is, apart from very arrogant, always asking advice from other people- even Kelly Holmes (though her coming back and telling everyone she'd been told she'd been training completely wrong for the past couple of years wasn't exactly subtle for her coach sadly.) My one point is though, unless they're a qualified coach, make sure you take what they say with a pinch of salt- I've found quite a few people who dish out sessions and yet they couldn't tell you why you're doing it!
I'd also look around at other clubs, if they're available, because my nearest only trained twice a week and very generalized- the one I'm with now have 5 different groups which all train almost every day!
Nice to see another 18 year old on here! Anyway, when you say running club, do you mean a proper track club? I've joined one a couple of months ago (generally for the weights and the subsidized races!) and guess I didn't like it too much (more because of the athletes than the coach!) I'm looking into joining another group within that club who specialize in endurance (though a bit more mature) but I've found generally all the coaches are very willing to give you advice/train you. I found google is great for finding any local track and field clubs
Also, it depends on what you are competing in? Though I'm the last person to give specialist advice on a particular event since this is my first year!
I have asthma. It wasn't affecting me when I first started running, then it suddenly started hitting me really badly at 2km- and since I was planning a 5km and 10km within the next three months it was not looking hopeful. I went to the doctors, and he told me to take my salbutamol a few minutes before the race (and during if I needed it) which surprised me since I only used it once an attack had set in. Then I ran the Great Manchester Run with no wheezing whatsoever
Personally I think it depends on the person about which medication helps which is why a check up with the GP is always useful. Also, if your asthma starts, don't push yourself for a PB when it puts your health at risk. Your asthma should improve with time.
I'm not experienced but I always preferred measuring distance instead of time (though sometimes saying I'll run 10 minutes means I can stick to practically walking pace!) I just ran a route, then checked on mapmyrun.com how far I'd gone- otherwise used a Garmin if I wanted to reach a specific distance. I guess it depends on how far you can run already, but if you set your mind to 5.6 miles it won't be too hard