Dating apps are not going to help with fear of rejection. At best, they can make you expect it, which will lead some to self sabotaging dating behavior.

I'll tell you the best benefit to dating apps, in my opinion. They give you a chance to practice dating and socialization skills and they give you a chance to date a wider variety of people that you may not otherwise have opportunity to meet and that in turn, will allow you to learn about yourself and what type of person you actually want to end up with.

But. And here's the caveat. It only works if you date variety for the sake of variety, you're goals are experience of meeting people rather than sex or a relationship, and you have to be upfront and clear the whole way.

If you've grown up isolated for whatever reason, it's a good way to catch up to your peers in social skills you may be lacking. Mixers, meet-ups, and single events are good for that too.