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Family and friends are not ideal beta readers, not only because they are more interested in preserving their relationship with you personally, but also because they are not necessarily your target group and likely not professionals that know what to look out for. 

You need people that know what they to look for in order to get feedback that helps you improve your style. It's not useful if someone who reads a lot but has no idea about the craft of writing tells you that they are "not feeling" the characters for example. You need to know the *why* in order to improve the situation. 

Furthermore you need people that are interested in your specific genre. Different genres have different styles and different things that are usual or unusual. The more someone knows about your specific genre the more detailed and specific their advice is, which again helps you get to the core of problems that arise when someone reads your writing. 

Therefore you need to find people that are: 

- not too close to you ; ideally in a professional relationship with you so that they are honest but still considerate enough to not metaphorically rip your writing apart 
- interested enough in your genre that they know about genre conventions
- available so that they can actually help you in a timely manner

You find people like this in writing groups. Look around near you. Search on the internet whether there are writing and critique groups near where you are living that you could join. Or look on internet forums that specialize in these sorts of things. 

Be aware that this will take time and practice to get right, too. You don't know exactly who you can trust and who actually knows what they are talking about. Get feedback from a couple people a couple times and see who fits the bill. With some people and their critique style you will get along better than with others, just be sure not to cheat yourself by only going to people that tell your everything is perfect or that everything is garbage. The truth is likely somewhere in between where there are things that are already nice and, especially in the beginning, a lot of specific areas that need improvement.