Need advice

1) Stop overthinking. If you overthink, you never end up getting what you want in the end.
2) Don't be needy. Even if you're being caring, people will take it the wrong way and your attraction level will go down.
3) Have some confidence. If you don't have the confidence to go up to a girl, and say "Hello, you seem cool, what's your name, great to meet you, my name is..., if you vibe, then say, you don't have to but we should hang out some time, if she says yes, say give me your number then and we'll set a time and date etc." Then you're never going to have a relationship, even if you get rejected it shows that you had the balls to go up to her, talk to her and throw your cards down. Don't be creepy though.
4) Don't be a door mat. If you're that guy who girls use for homework, notes etc. then learn how to say no, like "Oh, you only talk to me when you want something huh?" Standing up for yourself, but not aggressively increases attraction and respect most of all. No girl wants to be with a guy that doesn't respect himself.
5) Groom yourself well and dress in clothes that make you feel confident. Guys that even are short can catch a girls eye, by what they wear, i.e the aesthetics, leather jacket, nice pair of jeans, nice shirt, nice pair of boots, hairstyle that suits your face shape, well trimmed beard or clean shaven. It's all about power dressing and power styling that makes you feel confident, this will give you a presence that makes you stand out amongst most other people.
6) Be comfortable with long conversations and silences. Comfort is the best way to make a girl feel safe around you. If you are acting all awkward, nervous etc. then she will be too, and girls don't like being around guys that make them feel uncomfortable. This all comes down to confidence at the end of the day, so practice some conversation, compliment, but don't be a simp, take her to a nice place like a walk down the beach, walk in the countryside, a nice park, rather than a restaurant etc. as this will make her feel confined and it's not a great first date thing either.

Hope this helps! But honestly man, find some confidence that's key first before you do anything with girls.

I use to be 1. and 4. however with your fourth point, I did this with one girl when I stated a "no" to her. She took it personally and went and asked a jerk who did help her and then he called me out in a class as a freak.