Having been doing this for a few months now, the online dating scene can be very daunting but the main thing is confidence. Rejection is a hard thing to accept but you've got to be optimistic that there's someone out there who'll think the world of you, flaws and all. Learn to love who you are and what you have to offer, you need to love yourself before you can love someone else. Going in with a mindset that tells you you can't attract someone is going in with a defeatist attitude, it's all about turning that way of thinking around.
Of course it's a chore trying to find someone, I'm still trying to but these things take time. I know my own worth and I know what I can offer, and I believe someone will see that and think "this is who I want". Time and time again I would speak to a girl and think things are going well only for it to do a u-turn but I accept that and move on. Getting down on yourself will only hurt you, and you know what you have to offer. Also don't be what someone wants you to be, be what you want to be. Changing yourself to make someone interested in you is only going to backfire. If the person you like believes in something and you don't then don't say you do, no point in lying about it.
On the other hand it's difficult to let someone down who's connected with you but you yourself no longer feel that connection. There was one girl who really liked me but I just couldn't continue it and we were both very upset. I'm confident she's found someone or is on the path to finding someone else, much like I'm on the path to do so.
Also try to enjoy life outside of meeting someone. If you can enjoy your own company that's excellent, you're not relying on others to make you feel good. Whether it's sitting in and enjoying a film or video game or taking a scenic walk, just do you first! And it's great to spend time with friends also, be in others company and enjoy having good times. Hobbies are a great way to enjoy activities with friends, or being in here reading and discussing topics you're interested in.
I may not be any closer to finding someone but I'm certainly not down about it