I know people hooking up and keeping relationships on okcupid, and POF(plenty of fish), Tinder has worked too, I don't know if it's my friends that aren't relationship material but it seems like Tinder is for the one of hookups.
I have been shy and introverted since my teens, now I'm just introverted.
I would meet girls, usually mutual friends, we would back then exchange MSN or Facebook ID's. I would then chat with them get to know them, and when things got more comfortable casually slipping in gentle flirting. They would always want to meet me. I've never sent a dick pic to them. That wasn't the age of dick pics for me(or I didn't know it was a thing).
Now days there are so many social media platforms, and more open minded girls.
I'm not the kind of guy to walk up to a girl with some retarded pickup line. If they like that shit they aren't for me.
The smile from a distance and the hi(and the very next thing is your name when a conversation starts, maybe compliment her name<if you genuinely like it>), is a great start to the chemistry. Don't think to hard about what you are going to say. Don't flower her with all your compliments in one go. Just one, doesn't actually have to be about her, strange enough. Could be her t-shirt! Use the environment to your advantage. Ask her if she regularly comes here, to the gym, the supermarket, the park. Keep it relevant, take an interest. Don't be obsessive.
That the gym - Harder to approach, easier to say something. You could compliment her arms, back legs, whatever is her best feature relevant to working out. Ask her what she does and maybe how to do it. If you or her are into spinning, boxing aerobics or whatever maybe you could talk about the trainer and other classes.
At the supermarket - Easier to approach, harder to say something. You can't really jump out with a cucumber and say I imagine you would look great handling this(you could, but that's a tough one to get away with). I recommend you don't try that. You could say like mmmm.. Fruit and veg I'm trying to keep healthy. Have you seen the price of the salmon(or anything usually overpriced, now cheaper). Maybe you are cooking for your friends and you are nervous of what to cook, you could be polite and ask for advice. If she's buying alcohol you might be bold enough to ask if she is having a party.. Don't use that unless you are good in a party environment. Candy and chocolate that you both obviously like, Ohh.. Those are my fav. I just munch them down while watching(suggest a likeable show like Game of thrones, Sons of Anarchy, Breaking bad, misfits<use one you know and can talk about>, Don't go to feminine or to masculine with your pick. Humour is probably the best, you know comedy!)
If things go well, maybe suggest getting together for a coffee/tea/hot chocolate(Some people may say I don't like coffee or tea or chocolate or even hot drinks. Think fast ask what they like and compromise) to talk more, and get to know each other.
In the park - Pets, you don't have to own one, you just need to be loving. Most girls/women get weak in the knees with animals. Ask about the pets name, establish the breed. Maybe mention one from you your childhood.
I hope you understand where I am going with this and I don't spend my entire morning writing. Feel around for a good vibe, if you get rejected atleast you tried. That way you don't regret never trying. Don't feel bad you might not be her type. Maybe she just has a thing for Tall black men with average but thick cocks. Take it with a pinch of salt.
Trick is you need to be able to talk and make them feel comfortable, making her laugh is a big plus. Try not to let it get awkward. Don't mention your are a member on here or that you watch porn unless she is genuinely interested in porn. And we'll don't mention this site unless you are willing to lose her for a longer, thicker, more massive penis.
Good luck happy muff hunting!