I'm 19 turning 20 Sunday haha
You might be too young for Tinder btw For men, tinder etc. gets good once you don't look like a boy anymore (and stops being good once you are creepy-old and fat).
Tinder is 18+ and depending on where you live, it's starting to pick up in user numbers in the twenties age range. Even the girls your age are likely more interested in a guy a couple of years older than themselves. That basically only leaves the few 18 year olds and the ones faking their profile.
@pics: Pic 2 is good, the rest is not. Selfies are to be avoided, especially the mirror ones. I have one myself but only to show a bit of muscles and I put it as the last pic to avoid scaring girls off.
The pic with your friends would work if they weren't even younger looking than you. Girls will think you are 16.
Also, get used to writing first. Pretty girls get too much attention so unless you are way hotter than them, you have to make the first move. It's also kind of expected as some sort of manners. Many will be glad you finally write them so that they are "allowed" to chat with you.
It's not a big deal, there's no real rejection as you don't get a "no" but just silence.
Write more than Hi/Hey. Just tell what you doing that day and pick some aspect from their photos/profile. Being Haha-funny is enough. There, you're already doing better than 90% of your competitors.
I usually do the messages for new matches in batches and just copy paste most of my original text and change the names etc. I'm lazy (efficient?)
Finally, when you actually meet you better be just like the person she imagined from your profile. Not only regarding looks and likes. There's no point in pretending to e.g. be some super-confident womanizer if you are a shy wet towel on the date who can't hold an interesting conversation.