Well I think everything has been pretty much covered already, but WELCOME! Lol
I think checking up on the cals in food is important but whether you choose to count cals is up to you - some ppl find it too restrictive, etc. Ive noticed that just learning whats in food and how much I can eat a day is really helpful - I was surprised at how much I was actually consuming a day before, because I thought I was pretty good - no wonder I put on weight! Lol.
Im also 19 and at uni - so hey we have something in common! Lol.
Anyway, just wanted to say hi and good luck with your weight loss journey!