It is not harmful, the sexual power has to be intelligently channeled and brought under control. This is a very powerful and ancient tantra.
I don't think you should suppress yourself, you need to learn to master yourself and your natural powers.
First of all, strengthen your will, try meditations on black, brown color, also blue in your situation will help, because blue cools sexual ardor. You need to practice here not only in moments of arousal, but in general to be able to quickly enter a state of concentration.
If you are closer to the runes, choose: Naud/Iss/Ing, you vibrate the rune and feel its energies, meditate on the concept of energy, you do not need to accumulate it here.
Remember, you do not need to suppress sexuality, but to learn to control vulgar urges and the spread of energy, because it creates attachments unnecessary. You know what we're talking about, porn, sexual perversions and so forth. Yes, when you feel attraction coming from vulgarity, then meditate on color and you will have a cooling down very quickly.
When you learn to control the urges of arousal, you will be able to redirect your thoughts and sexual energy in a useful direction.
There are many options, I suggest you consider strengthening the chakras and increasing the vitality of the body.
I will tell you about simple methods.
During sexual tantra, it is important for you to learn how to control this type of energy, you should feel the sexual electricity well, with practice you will be able to "inflate" it purely by intention.
We will discuss the issue of masturbation, but it will be different from what people do. As you start and finish during masturbation you will think only about achieving practical goals and I assure you will get considerable pleasure.
You can't think about other people, if you have a powerful drive, you can get excited by yourself, ignite this electricity and direct it to the chakra, or you can clean and enhance the central channel (sushumna nadi) or convert it into bioelectricity of the body.
I mean visualize the sexual force enveloping your physical body from within with the intention to strengthen, enhance and restore the health of the body, yes, the physical body has an electromagnetic aura, bioelectricity, it strongly influences your vitality. Every part of your body has this aura. You need to read atlases on anatomy if you want to be successful here.
There are two ways out here, the first is about orgasm, it is good when you need to send energy to perform a task, like witchcraft. You reach a climax and it's like a dynamic force of influence, like a lightning strike.
The second is the interruption of orgasm, it is necessary for the accumulation of sexual power in yourself. This is a practice known as Vajroli mudra, there is a lot of nonsense written about it on the internet, this mudra has levels of initiation. The most basic one is the one that allows you to interrupt the release through orgasm with the help of mulabandha, namely to stop at 99% and absorb all the power raised, this can be repeated about 2-3 times per session, do not exhaust yourself too much.
From what you desire specifically for yourself, you will get a cycle of sexual power within yourself, your sexual power works on you with pure and set intention, it will make you stronger, more attractive and healthier.