You have to talk to them and if you can make them laugh it helps a lot. If you just want to have sex there are some out there who will do that, likely after drinking too, and they're often trouble. One's that ignore you are actually fine, we all get that, they're intentionally sending you a signal they are not interested, so don't waste time with them.

There are some ways a girl will let you know she likes you. If they stand very close to you, stare in your eyes for some time, appear nervous, play with their hair while talking to you, laugh or giggle at things you say, and a dead giveway is if they touch you on the shoulder or arm. Most don't even realize they're doing this when they have strong attraction. Hope this helps.

Then you're fucked, you can't just have sex and leave it at that, and if you can, you're very lucky. Maybe one of those adult dating services. In my opinion hitting the gym would help, but that's what I do so I may be biased.

your at uni and you dont know anything about girls what are you studying rocket science

I am not experienced. I notice girls don't like it if I appear lazy or spit. I find it incredibly uncomfortable when a girl looks at me I have no idea what to say, I usually end up avoiding eye contact and walking away or grinning like a goofball and then walking away. I don't know if they are just flirting or want me to do something or are just being polite or what. I must have inherited my dad's social clumsiness. God I hope I haven't cos he is the most reclusive socially inept person you could ever hope to meet.

hook them in. that means bang the shit out of them when they're ready!!!