Sorry to hear that you're still feeling this way. You've done great in setting up an appointment with a psychologist. Hopefully they'll be able to help you work out a plan on how to work on yourself. I wouldn't say no to the relationship counsellor either, as they may be able to provide some solid advise about starting relationships. Speaking of advise, there was a video that I came across on Youtube, and it summarized some key points about being in a relationship. I'm not sure if linking youtube videos is allowed here, but you can look up "Things about Relationships I wish someone told me about Jaiden Animations". Take note of when they talk about "ecosystem".
The thing about social media is, it's always filled with positive/happy things. When someone who feels insecure about themselves see those things, they start to feel perhaps what others have would make them happy as well. But it's better to live life through identifying what truly makes you happy and pursue that, rather than basing your level of happiness through comparison of what others have. We are responsible for our own happiness, and it's tremendously stressful to our partners if we are to hand that responsibility off to them and are dependent on them for our happiness. If we do depend our happiness on another person, then we'll be devastated when that person is no longer with us, and this is how "rebounds" are formed in relationships. They broken hearted person seeks for another person to fill the void/loneliness, and would start expecting them to make them feel happy.
What I've learned from my break up (which happened more than half a year ago) was, it's best to learn how to live life alone while also learning how to collaborate with society. Seek out things that makes you happy by yourself, and learn to be comfortable living by yourself. Working on yourself first because you are your best asset, and only you know yourself best. Learn to value yourself, and show some self-love that you deserve. Enjoy the happy moments when you've found them, and appreciate the sad moments so you can improve yourself from it. The feeling of rejection does hurt, as I've felt that thru my break up, but things will be better over time. Give yourself some space from the dating scene, and work on yourself first. Just like what positive_vibes said, life will shower you with things when you least expect it to. Until that happens, work on your issues first.
Happy to chat more Dwings