Is it normal to have so many rejections?

I have been trying to find a girl since january and I've dated like 15-20 women. Maybe 10 were Tinder dates but from my uni. Non of them have worked and like 5 of them got to second dates. Is this normal? Am I doing something wrong here? Why do they date me in the first place if they're not interested?

It's not that they're not interested. They likely felt that they didn't click with you.

It's perfectly normal. Just don't give up.

I have been trying to find a girl since january and I've dated like 15-20 women. Maybe 10 were Tinder dates but from my uni. Non of them have worked and like 5 of them got to second dates. Is this normal? Am I doing something wrong here? Why do they date me in the first place if they're not interested?

I guess also some just want sex rather than something serious. How should i initiate for a relationship rather than just sex?

No it's not normal, you should be able to get with at least half if not more of the girls you take on a date... the only explanation I can think of as to why it's not going well for you is that there is a massive incongruence between how you present yourself over tinder (and the girls you meet in person) to the time of the second date. As I don't know you personally I can't tell you what's causing this incongruence but I can give you an example of how such a situation can occur:

1 - A man introduces himself to a girl in a cafe and they get talking throughout this conversation the woman develops the impression that this man is confident, funny, always presents himself well, has a deep love of animals and is caring. Because of these characteristics she agrees to go on a restaurant date with this guy.

The guy arrives at the restaurant and she's already there waiting, but for some reason during this conversation the guy doesn't act as confident as he did the first time they met, in fact he seems a little nervous and unsure of himself.

Now it's important to note that although this wouldn't be deal breaker it would create an incongruence effect whereby she becomes unsure as to why he's acting so differently and if he did this enough times she would come to the conclusion that he is not as confident as he made out thus reducing the amount of attraction she has for him.

Now this a very basic example and is exaggerated to make it clearer. But basically what ever your doing when you meet them isn't being reflected when it comes to meeting up with them for a romantic encounter. The best thing you can do is think about what characteristics made them want to go on a date with you in the first place and to make sure you're not inadvertently suppressing it.